Fate Stay/Night - Better Sperm (Medusa & Rin Tohsaka)

Summary: Through a strange turn of events, you and Shirou Emiya must supply mana to your Rider Servant Medusa and Rin Tohsaka, the genius mage. It's a matter of professionalism, that is until the ladies the difference between you and the young hero.

Let's just say even Rin, who is dating Shirou, can't help but take your thicker, luscious mana over her boyfriend's.

*********

The absurdity of the situation was almost enough to keep you from being able to perform at all. Almost. Lying side-by-side with Shirou Emiya on a massive bed, the two of you shirtless and waiting, felt like a bizarre dream. The reason—a sudden, critical shortage of magical energy requiring an immediate, large-scale transfer—was a distant, clinical thought in the back of your mind.

It was the Holy Grail War. Somehow, you ended up summoning a sultry Rider Servant. Big boobs, lady-like yet seductive, and often wearing a blindfold. She was the kind of woman that, when summoned by a good master like you, smiled and showed her softer side.

Rin Tohsaka and Shirou were not masters in this Holy Grail War. They were only here to aid you, an innocent. An innocent with a Servant, yes, but let's just say it wasn't exactly an intentional summoning...

But that was neither here nor there. What led to these circumstances, only that they were your circumstances. Rider was not merely struggling with mana, her Spirit Core had been damaged. It needed to repair, or else even using her Noble Phantasm would be impossible. With Rin, Shirou, and yourself, there was a glimmer of hope for repair.

The immediate, pounding reality was Rider and Rin Tohsaka standing at the foot of the bed.

Rin looked like she’d rather be anywhere else, her arms crossed tightly over her chest, a faint blush high on her cheeks. “This is purely a necessary procedure,” she stated, her voice tighter than usual. “A calculated mana replenishment. Nothing more. S-so don't get the wrong idea, you two!"

Shirou laughed, sweat-dropping. "Obviously, Tohsaka." His eyes did wander and you did the same. Rin's classic black skirt was on, though not her red top. That was discarded and she was only in a thin white top.

Cocks stirred. Balls churned.

"All we have to do is give you enough mana, Rin," said Shirou. "Enough to jumpstart that spell of yours."

"I-I would have been able to do this if I didn't already use my jewels," Rin grumbled. "But now..."

To make it simple, Rin being the genius she was had a spell that could repair Rider's Spirit Core. Such a spell normally required ten mana-soaked jewels, which she currently didn't have. Which meant she had to use you and Shirou as mana batteries. She was going to have to supercharge herself and swallow or take at least three loads.

And the thing was...Rider had to do the same. Less so because of the spell and more because of the damage itself. A damaged Spirit Core was like having a leak. Every second was causing her to weaken.

Rider certainly did not look weak though. She was in her usual erotic black dress, arms to her aside, the only missing piece being the boots. Her long pink hair sat over her butt and she had no issues with being a statue of cool, predatory, sexy calm. A knowing smile played on her lips, her violet eyes hidden behind her usual blindfold, though you had no doubt she could see everything. Everything.

“Relax, Tohsaka,” Rider said, her voice a low hum that vibrated straight through your boxers. “We shouldn't make the men nervous~"

"R-right..."

Rin swallowed. From what you understood from Shirou, she and Rin were dating but hadn't gone very far in terms of sex. Only kisses and the ever so often handjob. Never sex. This would be their first.

So it was only fair for Rin to crawl to Shirou with the grim determination of a soldier marching into battle. Boyfriend and girlfriend. Shirou tried to comfort her with a grin. It was hard to tell whether it settled the tsundere's nerves.

Rider, however, flowed up the bed toward you. She was so liquid and graceful the mattress barely dipped. Boobs stole your attention. That dress of hers, with how tight it was and how it pushed her tits up, was a damn male gaze stealer. Even Shirou's eyes flicked away from his girlfriend to the crawling snake.

Smirking, Rider put her face above your boxers. A long, pink appendage that was far too long to be an ordinary tongue slipped out to tease you. But it was her tongue. This was not a human, this was a monster. A woman that was of divinity as well as hate itself.

Yet here she was, teasing your cock through your boxers. Near your bulge, she was a wall of soothing lavender scent and immense softness, her long, luxurious purple hair spilling over your chest like a silken veil.

“Now,” Rider murmured, her voice a private secret for your ears alone. “Let’s see what we’re working with.” Her cool, delicate fingers hooked into the waistband of your boxers. On the other side of the bed, Rin was performing the same action with considerably less grace, fumbling slightly before tugging Shirou’s boxers down.

The cool air of the room hit your exposed flesh. And there they were. Two flaccid cocks, side-by-side by circumstance. Both were… unimpressive. Shy. They looked nearly identical in their vulnerable, soft state. For you, there was a genuine reason. You weren't an actual mage so you had to get your balls emptied every day in order to supply Rider with the necessary mana. Literally, three hours ago, you had to cum into a bottle and hand Rider the bottle.

Rider was...sultry, but also sensitive. She did not want to have sex with you right off the bat. Only after weeks of knowing each other, fighting together, and nearly dying did this situation come to fruition. Rider was willing to sleep with you, only because you had proven yourself to her. Before, it was simply a matter of cumming into a bottle and making her drink it.

So yeah, your drained out wiener made sense. You caught a glimpse of Shirou’s, a pinkish, small thing, and felt a pang of shared nervousness. Did Rin empty him out too or something?

Rider’s smile widened. “So timid,” she whispered,. “All that potential, hiding away.” She shifted, allowing the incredible swell of her breasts to press against your cock, the heat and weight of them impossibly erotic. “I wonder what it will take to coax it out.”

Glances from Rin and Shirou were sent your way. They could hear the sultry remark.

Ringer's fingertips, finally, traced a feather-light path up your nutsack. You jerked at the contact. She wasn’t just touching you; she was mapping you. Her fingers walked on your sack, step by step. You couldn’t help but respond, a thick, heavy heat beginning to pool in your groin as blood rushed to answer her silent call.

On the other side, things were less graceful. “J-just relax, Shirou,” Rin stammered, her face crimson. She gave his soft length an awkward, dry pump with her hand. “We need to… you know… for the mana.”

"R-right!"

Shirou was getting hard, and fast. That threw away the theory that Rin drained his balls everyday. He was just nervous, a little small, and ultimately, very eager. The redhead got hard fast.

Rider’s attention was divided. She glanced over at Shirou, then back at your slowly growing cock. “Look at that,” she cooed, her gaze flicking between the two of you. “It seems the view is inspiring for everyone.”

And it was. Under Rider’s expert which only walked around your cock, never grabbing it and simply teasing to an extreme degree, you were hardening, lengthening, thickening with every second. Seeing your transformation, Rin grabbed Shirou's cock and starting jerking it.

"G-get bigger," Rin murmured, and redoubled her efforts on Shirou, her jerking motions becoming more frantic until he couldn't.

The climax of the reveal was breathtaking. Where once there were two nearly identical, nervous members, now there was a staggering difference. Shirou had reached his full, modest potential. A respectable, but utterly dwarfed, four inches.

Because you? You were fully, achingly hard, a thick, veined eight inches of solid arousal jutting up from your hips. You were a king on that bed. Your cock sat atop of Rider's face who smirked. Behind those blindfolds, however, there was a flicker of surprise. Even she didn't expect this kind of size.

Rin could show her reaction in full since she wore no blindfold. Her hand stilled on Shirou’s shaft. “O-oh,” she breathed, the sound full of genuine, unguarded shock. She’d only seen diagrams, clinical pictures. The reality of the spectrum was clearly a new, shocking lesson.

Rider’s smirk was triumphant, her voice a silken taunt meant for the whole room. “It seems I got the lucky draw.”

Shirou looked over and was about to ask, "Ha? What does that-?"

She didn’t give anyone time to dwell on it. She lowered her mouth to you.

The world dissolved into dicksucking. Her lips, plush and surprisingly cool, sealed around the head of your cock. Her tongue, that infamous snake-like muscle, flickered against your slit, a quick, torturous probe that stole the air from your lungs. It was like nothing you’d ever felt—intelligent, agile, and impossibly skilled.

This was Medusa's blowjob.

"H-nnggh!"

You made a loud grunt.

You dared to glance over. Rin, steeling herself, had finally taken Shirou into her mouth. She did not go deep at all, partially because she didn't have to. She only focused on the tip. Her tongue technique was clumsy and uncertain. Her dips were small and shallow, like she was afraid of taking his cock easily. Because, well, it seemed like it.

"R-Rin...!"

At the end of the day, it was serviceable, but it was a candle next to Rider’s inferno.

Rider took you down every single inch of your cock and then went back out, her long hair tangling over your stomach and chest, her tongue wrapping around your shaft in a way that defied human anatomy. She was no longer deepthroating, only doing it to experiment. She showed the full length of her tongue and its skill. Applying pressure in spirals, milking you, coaxing you toward the edge with every unhurried bob of her head. A low, continuous moan vibrated through her throat and into your very bones. She was enjoying this. She was savoring you.

"R-Rider...!"

Her blindfold eyes twinkled. You couldn't see her eyes and yet sometimes it felt like you could. It was how you knew they were violet in colour; there was this strange connection letting you see a snippet of them. Your hips bucked involuntarily. You were close, so close, the tension coiling unbearably tight in your sack. Rider sensed it. She showed everything she needed to, let her tongue slither back into her mouth, and returned to the classic deepthroating. Her throat opened to take you even deeper until your tip hit the back of it.

That was it.

"Cumming!" Your vision whited out at the edges. She didn’t pull away. She stayed there, taking your release, your eyes meeting.

A beat later, a muffled groan came from Shirou. You saw Rin’s throat convulse once, twice, as she swallowed his entire, measly load with a quick, efficient gulp. The mana transfer demanded it.

Somehow, despite you cumming first, Shirou's climax ended first. When Rin pulled out, she was stealing glances at you and Rider who were evidently not done.

Spurt, spurt, spuuurt!

You had plenty to release. Plenty for Rider to swallow.

"Haaah~!"

Rider finally pulled back, your spend dripping from her chin. She gave a lazy, contented swipe of her incredible tongue, catching a drop from her lip, but she made no effort to clean the rest. She let it stay there, a glistening badge of honor. “Mmm… potent,” she purred, her voice thick with satisfaction.

Spurt, spuurt!

To everyone's surprise, even the observing Rin, extra thick, hot ropes of cum painted Rider’s face and hair. "Ah~!" A second wind of sorts, with pearlescent streaks splattering across her pale skin and glistened in her purple locks.

Rin went wide-eyed and so did Rider. Her blindfold was ruined and covered in cum. "What a lovely surprise, Master."

With a smirk, she took them off. Rin did a double-take. "Rider, wait, no!"

"Don't worry. My damaged Spirit Core has temporarily locked away my Mystic Eyes."

Beautiful eyes greeted you, violet and glossy and making your cock twitch. This was it. This was the true Rider. Her real face. The gaze that you could always feel and never see visually was officially here.

"Such a good boy, aren't you, Master. Having all this mana for me~"

Rider smirked. Rin just sighed in relief. The genius mage sat back on her heels, a thoughtful, almost clinical frown on her face. She eyed Shirou's half-erect cock and wiped her mouth with the back of her hand, muttering almost to herself, “I suppose… the volume and viscosity are directly proportional to the…” she clicked her tongue at Shirou’s now-softening, small member, “…the source material.”

"What's that supposed to mean?" Shirou asked, genuinely confused.

Rider just laughed, a low, sensual sound as she gazed down at you, your massive cock still twitching against your stomach. “It means some sources are simply… more bountiful than others.” Her finger traced a slow, possessive circle around your sensitive head. "Isn't that right?"

The last drops of your release were still cooling on Rider’s face when Rin, ever the pragmatist, broke the sated silence. Her voice was a clipped, businesslike counterpoint to the heavy breath still fogging the air. "Right. That was… sufficient for the first transfer. But like I said from the start, need a significantly greater volume of raw mana to complete the core repair. At least three." She avoided looking directly at anyone, focusing instead on a point on the wall above Shirou. "I didn't realize guys went soft after the first one so soon."

"S-sorry, Rin," Shirou said, turning red.

"If want to do this in one move, we'll need deeper reservoir. A conjugal mana transfer."

Shirou blinked, his face a mask of confusion. "A what?"

Rider’s tongue, that incredible, prehensile muscle, snaked out to lazily collect your spend from her chin. She savored it with a soft, delighted hum. "He means we need to fuck them, Emiya."

The bluntness of it made Rin’s entire body flush a deep, crimson red. "Rider!"

"It’s the truth, is it not, mage?" Rider purred, not taking her unseen eyes off you. "Your theorom is clear. For a recharge of this magnitude, direct, internal emission is required. The most efficient way to transfer life force." She shifted, her hips swaying with a serpentine grace as she moved to straddle your legs. "It seems our duties are not yet finished."

Rin looked like she wanted to argue, to cite some obscure paragraph that allowed for a less intimate alternative, but then your cock rose to the occasion, pressed to Rider's stomach, to her womb. The grim set of her jaw, the way her shoulders slumped in resignation, told the true story. Rider’s damaged Spirit Core was a priority. She took a steadying breath and turned to Shirou, her expression softening into something more apologetic. "She's… not wrong. For the spell to work, we need to… connect. Fully."

"Well..." Shirou smiled. "We are dating. Let's do this."

With a resolve that seemed to drain the color from her face, Rin stood. Her fingers trembled slightly as she unclasped her skirt, letting it pool at her feet. Her thin white top followed, leaving her in simple, practical underwear that she discarded with a quick, nervous flick. Her body was assfull and elegant, subtle curves and small boobs with a fat, cheeky heart-shaped ass.

Rider had a lavish, womanly abundance. She was beautiful with big boobs, childbearing hips, and also tall. It was hot.

Seeing Ri nstrip, Shirou’s breath hitched. His cock, which had softened, gave a valiant, immediate twitch at the sight of his girlfriend laid bare for the first time. A bead of pre-cum welled at his tip, oozing slowly down his modest length. It was a sweet, earnest reaction, full of his deep, longing affection for her.

Rin climbed onto the bed, positioning herself over him with a clinical focus that couldn't entirely mask her own nervous curiosity. "Just… relax, Shirou. Let me…." Her voice was a soft, reassuring murmur meant only for him. She reached between her legs, her fingers brushing against herself, and then she guided him. The moment his small, eager cockhead pressed against her entrance, she paused, taking one final, steadying breath.

Rin sank down.

It was a gentle, loving motion. He filled her, but just barely. You saw the minute flicker in her sharp aqua eyes—not pain, but a dawning, internal realization. A quiet, "Oh." It was the silent acknowledgment of a reality that didn't match the unknown fantasy. She bit her lip, a gesture meant to hold back a sigh, and began to move, a slow, tender rock of her hips.

"Here...!" The first thrust. Seeing the lack of reaction, he went harder. "Again...!"

Again and again and again, he thrust. You fucked her. You grabbed her hips and used his athletic body to get her to feel his dick.

"You’re… doing so good, Shirou," Rin whispered, the words sweet and encouraging, a lie of omission she told for the sake of his heroic heart.

Rider watched them for a beat, a look of profound disinterest on her face. Then she turned her full attention back to you, and the atmosphere shifted, electrified by her raw hunger. "Now for the main course~!"

She didn't guide you. She simply rose up on her knees, positioned the throbbing, immense head of your cock at her slick entrance, and dropped her full weight down in one devastating, claiming plunge.

The effect was instantaneous and spectacular.

A sharp, choked gasp ripped from Rider. She was Medusa, she was sultry and in-control. Yet...

"Hghgnngghhhh~!!!"

Her back arched violently, her magnificent breasts straining against nothing. Her divine pussy clenched around you, a series of rapid, uncontrollable convulsions that milked your length in a breathtaking rhythm. Her head snapped back and shriek erupted her lips as her first orgasm crashed over her without warning. "A-ah! Haaah! S-so… f-full!" she cried out, her voice cracking with the intensity of it. "S-shooo Master! So much cock! W-won't! No! C-c-cummiiing~!!!"

Tall and full of sensitive pride, that was Medusa for you. She tried to dominate and failed when she felt the full scope of your cock.

Your cock was just too good.

The Servant rode the waves of her climax, shuddering and moaning, her inner walls fluttering around you in a dizzying, addictive pulse. Slowly, she leaned forward, bracing her hands on your chest, her long purple hair cascading over you like a victory banner. A dazed, ecstatic smile spread across her face. "Gods… I knew you would feel incredible… but this…"

Her eyes. You could see them. Feel them. Burning into you and telling you she wanted more. She did it herself too. Rider began to ride you, not with Rin’s gentle rocking, but with powerful, piston-like strokes that sank you to the hilt with every descent. Each one drew another breathy gasp, another broken moan.

"Oh gosh! Oh gods! Oh gooddsss! T-this cocckk! E-even Zeus could never...!"

The room was filled with two distinct symphonies. On one side, the soft, earnest sounds of Shirou’s efforts and Rin’s gentle, whispered encouragements. "That’s it… just like that…"

On your side, it was a riot of sensation. It was fucking loud. "I'm cumming! I'm cumming! I'm cummiiiing~!!!" Rider’s cries, the slick, wet sound of your joining, the way her nails dug into your pectorals. She was a woman utterly consumed, lost in a sea of pleasure only you could provide.

Fueled by the sight of your passionate entanglement, by some misguided competitive spirit, Shirou suddenly sat up, wrapping his arms around Rin in a tight embrace. "Let’s match them, Rin!" he declared. Rin was taken aback, especially by the kiss, and then the first thrust.

"S-Shirou...!"

The kiss ended and he began to thrust upwards into her with all his athletic strength, his hips pounding against hers in a frantic, desperate rhythm. Boobs to his chest, close and tight, he fucked her as best he could.

Rin gasped, more in surprise than pleasure, her eyes going wide. She held onto his shoulders, her body jostled by his enthusiastic but...

"N-not bad! K-keep going!"

"I will!"

...ultimately insufficient efforts. It was movement without profundity, friction without fire. Her lips were pressed together, her expression one of enduring patience rather than unraveling ecstasy. Shirou grunted and grunted. He looked her in the eye, thinking she was satisfied and just went harder.

Harder but not better.

Meanwhile, Rider was screaming your name. Each of your thrusts, deliberate and deep, sent another quake through her. She was cresting again, her third orgasm building with terrifying speed. "Yes! Yesss! Right there! Don’t stop! Make me cum again!"

You did that. Her legendary erotic composure was destroyed, her mythical grace replaced by primal need.

You could feel your own end approaching, a familiar, immense pressure churning in your balls. You gripped her hips, your fingers digging into the soft flesh, and drove up into her one last, final time, burying yourself as deeply as possible.

"R-remember! Don't pull out! Cum inside! Fill me! Heal me!"

"Right! I'm cumming inside!"

The world dissolved into white-hot sensation as you came. It was a torrent, a flood of raw mana and pleasure that seemed to have no end. Rider’s reaction was apocalyptic. Her eyes rolled back into her head, her mouth falling open as her tongue lolled out. A silent, breathless scream was etched on her beautiful face as her own climax was triggered by your eruption.

Rider seemed to pull every last drop from you.

A moment later, with a strangled groan, Shirou found his own finish inside Rin. He gave it everything he had but like last time, it wasn't a particularly long or dramatic series of cumshots. He filled his girlfriend up, tensing and grunting before collapsing against her.

"Mmm." Rin held him close, patting his back gently as she caught her breath. "It’s okay, Shirou. You did well. We did it." Her hug was tender, loving, but her eyes were open, staring over to her left at the scene of your brutal, satisfying union. You and Rider, you weren't lovers, only Master and Servant. It couldn't just be that, right? Or maybe it was? There was a strong, spiritual connection between Master and Servant...

"But that cock..."

"What, haah, was that, Rin?" Shirou choked out, breathless and exhausted.

"N-nothing!"

A complex, unreadable emotion swirling in their eyes.

Rider slowly, shakily, lowered herself onto your chest, your cock still nestled deep inside her, both of you slick with sweat and spent. Your hands rested on her ass cheeks, slowly groping and massaging them. Her face was directly near yours, nearly about to kiss. She only smiled though. Her voice was a shattered, blissful whisper. "Thank you...."

You smiled and gave her ass a nice, polite smack. "You're welcome."

The heavy silence in the room was broken only by Rin’s sharp, frustrated exhale. She pushed herself up from Shirou’s chest and cock. She grimaced at the cum leaking from her cunt.

“It’s not enough." Rin tried to sound clipped and clinical, a desperate attempt to cling to her mage-heir composure. She refused to look at you, at Rider, at the obvious, throbbing evidence of why her efforts had failed. “I didn't get enough from Shirou."

Shirou, ever the earnest hero, looked up at her with concern. “What? What did I do wrong? We… we did it, didn’t we?”

“You did your best, Shirou,” Rin said, her tone softening for a fraction of a second before hardening again. “But your best, in this particular arena, is… insufficient.”

You winced. That was harsh.

From your side of the bed, Rider let out a husky laugh. She was still draped over you like a contented, purring cat, her cheek resting on your chest. “The solution is rather obvious, don’t you think, Rin Tohsaka? The well is dry. You need to find a deeper source.” She pulled herself off your cock. Thwap! Your semi-erect fell on your thigh. Her open, full gaze slid from Rin’s tense form to your cock, which, though softening, was still a formidable presence on your thigh.

Rin’s head snapped toward Rider, her face flushing a deep, furious crimson. “Absolutely not! I will not—! That is—!”

“—the only way to complete your precious spell,” Rider finished for her, her tone leaving no room for argument. “Unless you’d prefer my Spirit Core to remain fractured? What will do then, hm?"

You felt the conflict warring within Rin, the disciplined mage warring with the curious, passionate woman she kept locked away. Her eyes, wide and hesitant, finally flicked to you. To your cock. A fresh wave of heat flooded her cheeks. She swallowed hard.

Shirou watched the silent exchange, a complex emotion—resignation, understanding, a flicker of something painfully like envy—crossing his face. He reached out, placing a gentle hand on Rin’s arm. “Rin… if it’s for Rider… if it’s what you have to do… it’s okay.” He pursed his lips, the words clearly tasting like ash. “It’s the only way.”

That broke her. The stiff set of her shoulders slumped in defeat. “Fine,” Rin whispered, the word barely audible. “Just… just get it over with.”

You got up. "Lie down first.”

"W-what?" Rin clicked her tongue. "F-fine! Fine!"

A fresh wave of stammering protests died on her lips as you grabbed her shoulders and put her onto her back. The contrast was immediate. Where Rider was all lavish curves and big boobs and smirking confidence, Rin had smaller tits and a shy, blushing disposition. Her C-cup breasts rose and fell in quick, shallow breaths, her sharp aqua eyes fixed on you with a mixture of terror and a forbidden, flickering curiosity.

Because your cock was fully hard.

"I-it's, err...a little bigger than Shirou's. Nothing more," she insisted.

"Riiight," Rider said from behind, chuckling.

You positioned yourself between her slender, toned legs. The head of your cock, already swelling back to its full, intimidating hardness, nudged against her entrance. It was so much wetter than you expected, and so much tighter than you could have imagined. You saw the exact moment she felt the difference. Rin's eyes, previously wide with anxiety, went impossibly wider. Her breath hitched, a tiny, sharp oh of pure, unadulterated shock.

It wasn’t just a size. It was a presence.

You pushed forward, not with a slow, gentle rock, but with one single, deliberate, claiming thrust, burying every inch of your eight-inch length inside her in one smooth, devastating motion.

The effect was instantaneous and absolute.

Rin’s back arched off the bed as if she’d been electrocuted. A sound tore from her throat that was nothing like the gentle sighs she’d given Shirou—it was a raw, guttural, almost pained scream of pleasure that vibrated through the entire room. “HAAAAAH! What is—?! Oh gods! I'M CUMMIIING~!!!”

Shirou literally flinched. What the fuck was that?

Rin's orgasm didn't build; they came swinging out. The first one triggered the instant you filled her completely as though...Shirou did seventy percent of the work and you did the rest. Huh. He did better than it seemed then. Near the end probably, when he was fucking her, Rin was probably trying her own orgasm to look cool.

Maybe Shirou and Rin just weren't compatible...

"Oh godss, CUMMIIIING~!!!"

Her fingers scrambled against the sheets, her head thrashing from side to side as wave after wave of sensation obliterated every last shred of her tsundere composure.

Her pigtails were there. Her blue-green eyes were there. The tsundere Rin Tohsaka could be embarrassed, but she should never sound like that. That…pathetic. That meek. At least with him, she only acted squeamish when he flirted with her.

But during sex? During make-out sessions? When she gave him an under-the-pants handjob? She was super shy. Super quiet. Not…not this.

“That’s exactly where I want it! That’s exactly how deep I want it! Haaahhh! Hggghhh! I can feel my pussy! I can feel my wommmbbb! T-this is it! This is a mana transfer!!” 

Shirou stared, utterly shell-shocked, his mouth agape. This was a Rin he had never seen, never heard, never even dreamed existed. This was a woman utterly enslaved by sensation, her discipline incinerated by pure, unadulterated pleasure.

You fucked her and she met every thrust with a broken, desperate keen. “Oh! Oh, fuck! Right there! Yes! Please!” she begged, her vocabulary reduced to primal, needy sounds. Her legs, which had been tense, now wrapped around your waist, pulling you deeper, her heels digging into the small of your back.

Imagine watching as a boyfriend. "Oh." Every snap of your hips was a lesson to Shirou Emiya. A revelation of what her body had been missing from him.

You could feel your own climax roaring toward you. This rutting was pure sex, nothing more. No love like with you and Rider, only sex. Rin felt your throbbing member. "Y-your big bastard...! Y-you're about to cum aren't you!?"

Wham, wham, wham!

Her eyes, glazed with pleasure, were locked onto yours. “Inside me!” she begged, her voice a hoarse, ruined thing. “Please, I need it! Fill me up! Give me all your mana!”

The permission, the raw need in her voice, was the final trigger. You slammed into her one last time and came. It was a torrent, a flood of intense, hot release that seemed to go on forever, painting her deepest depths with your essence. Rin screamed again, a second, shattering orgasm crashing into her the moment she felt the first hot pulse, her body bucking wildly beneath you.

As the last pulses left you, you felt a new, incredible softness press against your back. "So much cum, I'm a little jealous~!"

Rider molded herself to you, her magnificent breasts flattening against your sweat-slicked skin. She leaned her head beside yours, her long purple hair mingling with yours as she turned your face toward her. Her lips found yours in a deep, claiming kiss, her infamous tongue sliding into your mouth with a familiarity that spoke of miles of shared pleasure.

You were kissing Rider, the myth, the monster, the woman, while your cock was still buried to the hilt inside the heiress of the Tohsaka line, your seed flooding her system.

All the while Shirou Emiya watched.

You finally pulled out of Rin with a soft, wet sound, making her gasp and whimper at the sudden emptiness—another sound Shirou had never once elicited from her.

Without a word, your eyes locked on Rider’s smug, triumphant smile. You kissed her first. You pushed her down onto the rumpled sheets second. You smacked the head of your slick, spent cock against her cunt.

"That big dick of yours better make me shriek again," Rider said, giggling. Big dick, Shirou realized. Was that the difference? Was that what made Rider and even his girlfriend...

"Oh yessshhh~!!"

That was it seemed like when you entered Rider again. A Servant, a woman that could kill him in one blow, gushing and smiling like that, all because of a big dick.

Shirou got hard again. He looked at his creampied girlfriend and swallowed. "S-so, uh, do you have enough mana yet?"

"S-Shirouuuu...t-that cockk....i-it's soo..." Her eyes rolled back. "I need moreeee."

He smiled, relieved. He didn't realize she was talking about wanting your cock more, not his. But alas, that was what she was stuck.

...

...

...

Pigtails bounced. Shirou Emiya was having a difficult time keeping up. It just seemed impossible. Women were scary…!

"Come on, come on...!"

"T-Tohsaka! Rin! I-I can't...!" Shirou grunted. "I'm gonna!"

"Don't you dare!"

"Ngggh!"

He did dare. The sword hero came inside his girlfriend before she could orgasm once.

It had been twenty minutes and since then, you had been fucking Rider's brains out while Shirou had nutted two more times inside rin. To say he fucked Rin was wrong, she had been fucking him, mostly because Rider refused to let go of you.

Shirou lay on his back on a spare mat, chest heaving, completely spent. His cock, soft and wet, slipped out of her cunt. His girlfriend had been riding him. She let out a frustrated, breathy sigh, her perfect features etched with need.

“Dammit, Shirou! I told you to pace yourself!” Rin rolled off him, her legs shaky. “It’s not enough. The spell isn’t even half stabilized. I need more.”

A complete lie. From that last batch of baby batter, Rin officially had enough mana for the spell but she insisted otherwise. Especially since the person that could confirm otherwise did not exist. Even Rider did not know the intricacies of the spell.

From the corner, where you were kneeling between Rider’s powerful thighs, you heard her. Your own hips were still pistoning into your Servant, your balls slapping against her ass with a steady, wet clap.

Rider herself was...

"Nggghhh! Gshshkhkk!! Cocckkkkk!!! Cockckk! Cmmmiiinnng~!!!"

....fucked stupid.

"Hey! Rider has more than enough mana now!" Rin called out, pointing. "The spell isn't complete yet though!"

"Huh?" You looked over. "Really?"

"Yes, really!"

Soleaveherpussyandfuckmeinstead!

You pulled yourself from Rider’s delicious, clenching pussy with a soft splutch, earning a throaty groan of protest from her. The bed was king-sized and you moved the short distance, your heavy, thick cock swaying. It was far, far bigger than Shirou’s, and in that moment, it was everything. Rin’s eyes widened slightly, a flicker of surprise and intense hunger replacing her frustration.

“Hurry up,” Rin demanded, spreading her legs, revealing her glistening, pink folds. “Just fuck it into me. I need the mana. Now.”

You didn’t need to be told twice. You dropped to your knees, grabbed her thighs, and hoisted her legs over your shoulders, pushing her knees toward her chest, bending her into a perfect, deep mating press. You positioned the broad, leaking head of your cock at her sopping entrance. You could feel the heat radiating from her.

“Ready for it, Tohsaka?”

“Stop talking and fuck me, you idiot!”

You drove forward in one relentless, deep thrust. SQUELCH. Her tight tunnel stretched around you, a wet, hot, unbelievable velvet vice.

First thing's first: a loud moan. Second, her head thrashing side to side. Third, an orgasm.

Then you thrust a second time.

“FUUUUCK!” Rin screamed, her back bowing off the floor. “OH GOD, YES! THAT’S IT! THAT’S WHAT I NEEDED!”

You set a brutal, punishing pace right from the start. There was no gentle warm-up, no slow build. This was a transaction, a transfer of pure energy, and you were the conduit. You slammed down again and again.

PLAP—! PLAP—! PLAP—! PLAP—! PLAP—! PLAP—! PLAP—! 

“This dick, this dick, THIS DIIICK!!! SO MUCH DEEPER THAN ANY COCK I’VE FUUUCKEDDD!”

In the background, all Shirou could do was sit up and watch. He pursed his lips. In his head, how was he supposed to react?

“I couldn’t even give her enough mana…”

Your pelvis smacking into her ass with loud, meaty thwacks that echoed Shirou’s feeble attempts from minutes before. Echoed but were ultimately not the same. Each thrust forced a choked gasp or a wanton cry from her lips.

“Haahh~! You didn’t think you could outfuck Medusa in a mere twenty minutes?” She was back. Rider slithered up behind you, her cool hands a stark contrast to the burning heat of your body. One hand snaked around to roughly pinch and roll your nipple, sending a jolt of electric pleasure straight to your cock. The other hand traced the line of your jaw. Her lips found your ear, her breath cool as she whispered.

“But I am glad to see this. You fill her so completely, Master,” Medusa purred, her voice like silk. “Look at her. She’s never been fucked like this. She’s drowning in you. Give her everything. Empty your full, heavy balls deep inside that greedy little cunt.” Her words were filthy, encouraging, pushing you harder.

“CUMMING, CUMMING, CUMMIIING~!”

You fucked Rin harder, deeper. All these creampies, all this cumming, and yet you had to deliver more. Your vision starting to blur at the edges with the intensity of it. Rin was a mess beneath you, babbling incoherently, her brilliant mind shattered by the divine pounding of your cock.

You fucked a goddess into submission. Fucking a genius mage was far, far easier. 

“Y-yes! Right there! Don’t stop! I can feel it… the mana… it’s so… oh fuck, I’m gonna—”

Her sentence dissolved into a wordless scream as her orgasm ripped through her. Her pussy clamped down on your shaft like a fist, milking you, pulling at you. You felt her juices seep out around your pumping length, making an even bigger mess.

“So, uh…” Shirou was standing. He was officially the first to get off the huge bed. “Um…”

“CUMMININNNG, THIS DICK IS MAKING ME CUMMMM~!!”

“Dear me, Shirou.” Rider looked over at him, smirking. “How about some water, hm? For Rin? She will need for the spell.”

“R-right. The hotel will definitely,” he murmured and left quickly. He did have to return to grab his boxers, which coincided with Rin screaming:

“I CAN’T LIVE WITHOUT THIS COCKKKK~!!!”

Shirou had been frozen stiff until Rider kindly reminded him, “Water, remember? And this is all apart of the ritual. Her emotions are intensified.”

“R-r-right…”

…

…

…

Five minutes later, the hotel door creaked open. Shirou stood there, holding two glasses of water. 

He couldn’t say anything. His gaze took in the scene: his girlfriend, legs pinned back, being utterly ravaged by you, her body convulsing in a pleasure he clearly hadn't been able to provide. His eyes dropped to where your bodies joined, to the way your substantial, full balls slammed against her each time you bottomed out inside her.

Rin was in no state to answer. She was too busy cumming for what sounded like the thirtieth time, her eyes rolled back in her head, a continuous stream of pleasured nonsense falling from her lips. “Mmmnpfh… g-guh… more… fucking… yes!”

Rider, still nestled against your back, turned her head slightly toward Shirou. Her tone was perfectly happy and content. “Ah, Shirou! You’re here!”

“He’s, uh….” Shirou’s voice was a small, strained thing from the doorway. “So when are you going to be done?”

Rider turned her head, a slow, deliberate motion, her cheek still resting against your sweat-dampened back. Her smile was a curve of pure, predatory amusement. “Well, that’s up to Rin, and look at her. Perhaps she knows something we don’t…”

Shirou’s gaze was locked on the spectacle before him. On Rin. Getting fucked in a mating press, your thrusts like an arc as they went from tip to base. Her fingers were clawing at the rumpled sheets as you pounded into her. Squelch! Thwack! Squelch! PLAP—! The sounds were obscene, a stark contrast to the timid little sighs she’d gifted him.

“I, uh, brought water,” Shirou mumbled, holding up the glasses as if they were a shield.

“How thoughtful.” Rider’s voice was a low, husky purr. She finally untangled herself from you, rising from the bed with a serpentine grace that made Shirou’s breath hitch. She padded across the room, completely naked, her movements unashamed and powerful. She stopped mere inches from him, her height forcing him to look up slightly.

Her eyes drifted down, and her smirk widened. “Oh? What’s this? The show seems to have affected you more than you let on, little hero.” Her cool, slender finger traced the very obvious bulge straining against his boxers.

Shirou flinched as if burned, his face flushing a deep, mortified red. “I— that’s not—!”

“Shhh,” Rider cooed, her finger applying a gentle, teasing pressure to his balls. Then, slowly, to his cock. “It’s a natural reaction. Don’t be embarrassed. Watching a true master at work can be… instructive.” She leaned in closer, her voice dropping to a conspiratorial whisper. “And don’t you worry. Once this ritual is complete, she’ll be right as rain. You can have her back. You can fuck her just like you always do.” 

A promise. A dismissal, simultaneously reassuring and utterly emasculating.

On the bed behind her, your rhythm stuttered. You grunted and you buried yourself to the hilt inside Rin. You had to cum. Her pussy muscles fluttered, you grabbed her hips, holding her down as you emptied yourself, a hot, pulsing flood of release that had Rin shuddering beneath you, a weak, mewling sound escaping her lips.

You pulled out with a soft, wet sound, and Rider glanced over her shoulder, a look of profound pride on her face. “Mmm~!”

Rider wanted it now. 

She turned her attention back to a spellbound Shirou. “Why don’t you make yourself useful? Go and prepare some food. All this strenuous activity requires sustenance.” She plucked the glasses of water from his limp hands. “We’ll be along shortly.”

“R-right, but…”

“Like I said, it’s up to Rin. I’ll ask her. But I get the feeling, well, judging by the condition of my Spirit Core,” Rider emphasized, “that it will take a while.”

“Right. Right. We are doing this for you.” Shirou just nodded, his eyes glazed over, and handed the water over to Rider. He then retreated from the room without another word, the door clicking shut behind him.

The moment he was gone, the atmosphere shifted. The pretense of the ritual evaporated, leaving only the raw, hungry truth of the room.

Rider set the glasses down on the side-table and glided back to the bed. Rin was struggling to sit up, your seed already beginning to trickle down her inner thigh. Her eyes were fixed on your cock, which, impossibly, was already swelling back to life, shiny and slick with her own arousal and your combined releases.

Your head lay on the pillow, hands behind you. You were fully erect and hungrily eyed these cum-hungry sluts. Both nude, both yours to creampie and fuck as you liked. 

“Incredible,” Rin breathed, the word full of awe instead of her usual frustration.

“Isn’t he?” Rider agreed, already beside her. “I think such a generous tool deserves our full attention, don’t you, Rin?”

Rin nodded, a new, determined light in her eyes. She was done fighting it. She wanted this.

Suddenly, they were side-by-side. Suddenly, they were staring down at your cock.

Rider went first. She leaned in, her long, infamous tongue, slithered out, not with a tentative flick, but with a purposeful, knowing stroke. It was cool and impossibly agile, and she didn’t just lick—she worshipped. She lapped at the base of your shaft, tracing the thick vein along the underside, her tongue flat and wide before tapering to a precise point that swirled around the swollen head, collecting the mixed taste of her and Rin.

Rin watched, mesmerized, for a moment before finding her own role. She lowered her head,  shyer. She nuzzled into your heavy sac, her nose brushing against the skin. Then her own tongue, small and warm, darted out. She began to lick and suckle at your balls with a hesitant greed. She was learning, mimicking Rider’s devotion, her brilliant mind focused entirely on this new form of study.

Medusa and Rin Tohsaka…

You let out a long, long sigh. With these two, with one worshipping your cock and the other your balls, it was complete heaven. 

The dual sensation was overwhelming. Rider’s expert, elongated tongue working your length, while Rin’s tender, explorative worship focused on your nutsack. You could feel the pressure building again, a tight, coiling spring deep in your sack.

“Hehe, I can feel it,” Rin said with a smile. She then kissed your left testicle. “Isn’t this one heavier?” Another kiss, this time to the rest testicle. “Or was it this one? I should have paid more attention in biology…”

Throb, throb!

Smirking, her hands coming up to gently cup and massage them. Then again: “Mwah! Mwah!” 

Rider sensed the hard throbs. She pulled her mouth away with a soft, wet pop. “Look at us, Master,” she whispered, her voice a sinful melody. “The proud Tohsaka heir and the Gorgon herself, brought to our knees for you.” She tilted her head, signaling to Rin.

Understanding flashed in Rin’s eyes. She moved up, positioning her face beside Rider’s. They both looked up at you, their faces side-by-side: one a mask of confident seduction, the other blushing with a dazed, needy hunger.

You didn’t need more invitation. You gripped the base of your cock and with a few rough, eager strokes, you let go. Your cum painted their faces in thick, white streaks. Rin gasped as the first hot jet splashed across her cheek and lips, her eyes wide. Rider, however, simply closed her eyes, a serene smile on her face as she took her share across her chin and neck, sticking her tongue out to catch the last few drops.

The door creaked open. Shirou stood there, a tentative look on his face. “The food is almost—“

He stopped. His eyes landed on his girlfriend and Rider, their asses high and pussies exposed. Dripping with your cum, glistening, all because of you. Your cock, your balls. This was the first time Shirou had seen the state of his girlfriend’s pussy so plainly.

His legs forced him to forward. To see it all.

Shirou swallowed. He only had to take three more steps to see everything from a side-view. To see the amazing shape of his girlfriend and Rider, and to see his girlfriend’s face glazed with another man’s cum. He…never thought it’d be like this. Rin Tohsaka, the girl who he loved dearly, kneeling naked beside the majestic Rider, who wore the same mark with pride and gazed up on the cock of another man.

Rin didn’t even look at her boyfriend. She didn’t know he was here, probably; her tongue darted out to taste the tip and she giggled. “So good~! I didn’t realize mana transfers could be so good!” 

The pigtails. The eyes. It was still Rin Tohsaka. Still his girl. Only...different. Changed. Because of a big dick.

All he wanted to do was ask them what they wanted. Without a word, he left the room.

“I-I guess I should just go for Chinese, huh?” Shirou murmured.  "Some veggies too. Rin will definitely need them after..."

After the ritual.

Yes, when the ritual would actually end, he had no clue. All Shirou could do was wait while you blew Rin back out while manhandling Medusa.