Becoming my Girlfriend’s Dick [Willing TF]

Kira (they/them)

Rebecca (she/her)

Red (she/her)

Rebecca sat naked on her girlfriend's lap, warm under the blankets as they sat up in bed. She could feel Kira's damp panties as the non-binary woman humped her big, wonderful booty. Her long, amber hair sometimes got in Kira's mouth, since their head was resting on her shoulder.

Rebecca, having both a cock and a pussy, was wetter than an ocean. Stroking Rebecca's cock oh-so lovingly, Kira felt warm, sticky precum running down their right hand, which squelched with each careful jerk. Kira's left hand, meanwhile, slid in and out past Rebecca's drooling labia lips.

Kira felt so satisfied at how absolutely drenched they made their lover. Rebecca loved having a dick instead of a clitoris. It was so perfect - or at least, as perfect as it could be. Both partners loved to pretend that Rebecca was Kira's dick. As such, the pair often sat together like this, Kira jerking Rebecca off as if her cock belonged to them. The only thing that could possibly make it better would be if she could truly transform into their dick.

"My good girl~" Kira cooed lovingly. “My big, strong cock Becca loves when her owner strokes her… Isn't that right, my adorable thing?~"

"Oh Owner! I do! I love it when you stroke me… I love feeling your warm hands wrapped around my shaft! I'll be your good girl, I promise!" Rebecca moaned excitedly as her partner kissed her neck. “Use me! Please use me! I'll make so much pleasure for you, I promise! I love you, Owner! Ah! Ah! Owner, I'm cumming!"

Kira felt as Rebecca's member pulsed and shot spurts of cum onto her chubby tummy. The thought of using their girlfriend as their cock, of shooting their load out through their wonderful Rebecca, pushed Kira over the edge. Together, the partners came in unison, as if they really were sharing the same orgasm.

Both of them took a moment to catch their breath.

"I love you, Owner~" Rebecca lovingly nuzzled her girlfriend's neck. "I wish I really could be your dick whenever you want…"

"Me too, honey." Kira kissed Rebecca on the head.

At that moment, the pair's roommate, Red, felt a signal run through her spine from across the city. Red was a succubus disguised as a human, but neither Kira, nor Rebecca, knew as much. She sensed them making a wish together, and knew that she could grant it. Tonight, she would reveal her true nature to them and offer to grant their wish.

Red had a sixth sense for kink, love, sex, and romance - such power came with the territory, being a succubus and all. She knew both her roommates were polyamourous, and crushing on her hard. She suspected they'd ask her out any day now. She had grown rather fond of the two lovebirds, and would accept an invitation into their polycule.

—

That evening, Kira, Rebecca, and Red shared a meal together in their apartment. Red had cooked a delicious meal for them all in celebration of her imminent surprise announcement.

"Thanks for dinner, Red!" Rebecca smiled.

"Yeah, thanks Red! Also, we actually have something to say. Do you want to say your thing first, or us?" Kira asked.

"You two go first. My thing is pretty big, to be honest," Red replied.

"Alright then…" Kira began. "Red, would you like us to be your partners?"

Rebecca was blushing as she held her breath. Kira's heart seemingly paused to wait for Red's response.

"Of course I would!" Red grinned, bearing her sharp fangs in a brilliant smile.

Kira and Rebecca were beaming.

"But," Red continued, "you should hear what I have to say next before deciding. You see, believe it or not I'm a succubus."

"Wait… what?" Kira raised an eyebrow.

"Watch this, loves~" In a matter of seconds, Red disposed of her human disguise and transformed into her true form: two long, thin horns sprouted from her forehead and adorned themselves with jewellery; a thin tail tipped with a violet spade extended out from behind her; her long, flowing violet hair gained an incredible sparkle, like a glowing geode; her body seemingly set itself ablaze, burning her natural crimson hue back into her skin; her plain tee shirt and jeans reformed into a snug black rubber catsuit with red accents; and finally, two huge bat-like red wings formed on her back with a wingspan of about five metres when fully extended.

"Red… holy shit!" Kira gasped, a lustful twinkle in their eyes.

"That's so cool!" Rebecca gaped.

"This is the real me." Red gently spun on her heel, showing off her body from every angle. "Still wanna be my girlfriends?~"

"Hell yeah!" Rebecca cheered.

"Of course we do!" Kira beamed. The three gathered in a group hug. "We've loved you for quite a while now, Red."

"I love you both, too. I knew I liked you two since the moment I first laid eyes on you." Red ran her gloved hands down her new partners' backs. "There's something else I wanted to say, darlings~"

"Oh?" Rebecca said. "If it's another huge reveal like this, I might faint!"

"Not a reveal, just me telling you more about my powers." Red withdrew from their shared hug. "I have a sixth sense. I can tell when people could use my services, and earlier today I sensed you two make a wish together - a sexy wish, one that I can grant~"

"You can grant wishes!? Holy shit!" Rebecca leapt with joy.

“You better believe it, babe~” Red winked. “For you two, since I’m so fond of you, I can grant your wish for free. However, you could always repay me by dedicating yourselves to me if you’d like! Hee hee~”

“Sounds wonderful~” Kira swooned.

“Kira, we could be Red’s forever! We could be her good girls together!” Rebecca imagined.

“Woah woah woah, you won’t become my property or anything. Us demons aren’t like the movies or whatever. I won’t own your souls like so many humans think, you can still withdraw consent whenever you want. I may be a demoness, but I’m not evil.”

“Well…” Kira drew out the word. “What if we want to be yours forever?”

A loving smile crossed Red’s face. “Well babe, that can be arranged~"

Red once again embraced her new lovers, who both returned the hug and simultaneously kissed her on the cheeks.

"How about you two strip out of those clothes? I've got a little something to give you~"

Returning to their bedroom, Kira and Rebecca slid out of their clothes and exhibited their bodies for Red to admire.

"Both of you are so gorgeous~" Red playfully bit her lip. "Now, do you two accept to become my thralls for however long you desire?"

"Of course!" Rebecca chimed.

"We do!" Kira added.

"Then say 'yes, Mistress~'"

"Yes, Mistress!" They said in unison.

"Good girls~" Red knelt before them and placed her index fingers on their pubic regions. "Now take my blessing and protection, darlings! Feel the warmth of my crest emblazoned on your mortal forms, and know I will always be there for you."

As she withdrew her hands, a glowing crimson symbol appeared where the demoness had touched: two hearts, one large and another smaller inside; twin horns above the humps of the large heart; and two wings identical to the ones on Red's back.

"Now darlings, what is your wish?"

"I want to be Kira's dick whenever we want!" Rebecca said. "I want to be a part of their body so I can give them so much pleasure!~"

"I want that too," Kira blushed.

Red snapped her fingers, creating magic sparkles that fizzled out as quickly as they appeared. In her hand was now a sparkly pink dildo in a strap.

"Whenever you want to merge, use this. It will automatically undo the transformation the moment either of you want to stop." Red handed the strap-on to Kira.

"Can we try it now?" Rebecca turned to Kira with starry eyes.

"Of course, hon!"

Kira put on their new toy, taking a moment to run a hand down its length, then gently slid it into Rebecca's dripping pussy. Waiting in the doggy position, they both felt a magical warmth spread throughout their bodies. Rebecca's ass melted into Kira's lap, fusing their bodies together into one. The dildo and straps dissolved into their shared form as Kira began to feel Rebecca's sensations as their own.

Rebecca's legs curled up and began to shrink into testicles. Kira's reproductive organs were reshaped like living clay, fusing with Rebecca as their womb and ovaries became a prostate and testes. The soon-to-be cock's arms snapped straight to her sides and began to merge into her torso. Her tits shrunk away as her body lost its curves, becoming more and more tubular by the second. Her vagina vanished and her own dick melted away. As the phallic woman stiffened and shrunk to the size of a dick, she realised she was drooling - but it wasn't saliva.

"C-cum! Kiwa, I'm fiwwed wiff youw cum!" Unable to speak clearly through a mouthful of her lover's precum, Rebecca twitched excitedly. "Ownew! Use me! Pwease!"

Placing a hand on their still-transforming member, Kira gasped in ecstasy as Rebecca's nervous system assimilated with their own. She was so sensitive! Rebecca's body twinged as it settled into its final size, just over six inches long.

'Owner! Owner I love you! This feels so good~' Rebecca tried to speak, but she couldn't. Instead, she could communicate with Kira via thoughts. Red, being the succubus who granted their wish, could also hear her if Rebecca so desired.

"I love you too, sweet thing!" Kira replied through tears of joy.

The final phase of the transformation began to reshape Rebecca's still-human head into a glans. Her hair vanished as her eyes, ears, and nose sealed over and her mouth became a urethral opening. Her face reddened as Kira's blood pumped through her whole being. Despite no longer having eyes or ears, Rebecca could observe herself and her surroundings as well as perceive sound.

Finally, Rebecca's transformation was complete. It felt divine to be so stiff and so hot, to feel Kira's pulse racing through her, to share her every sensation with her lover! The newly created cock could feel only her glans, shaft, and balls. Kira, however, could feel both Rebecca's body and their own.

More precum leaked from Rebecca, the very eager cock. 'Owner! Owner! Am I your good girl now? Did it work? Can you feel me?'

"I feel you, honey! You're my good girl, forever and always~"

Kira gave their phallic girlfriend a gentle squeeze, making Rebecca reflexively throb and spurt a drop of precum.

'Ahhh~ this feels better than I ever imagined!'

"Mmm… My beautiful, gorgeous girlcock…" Kira thrusted into the air, feeling the new and exhilarating sensation of a dick bouncing between their legs.

'Use me! Owner please use me! I need to give you and Red pleasure! I need to make so much pleasure for you!’

"Nnng! Isn't Becca just so adorable, Mistress?" Kira moaned.

"You both are, darlings~" Red smiled warmly. "Where do my good girls want me to touch, hmm? What shall Mistress do with you?"

'Touch me Mistress!' Rebecca pleaded.

"Everywhere! Touch us everywhere! Do whatever you want! Oh Mistress, please control us!"

Red again snapped her fingers. A holographic padlock appeared around Rebecca, locked shut, then faded away. "You're not going to cum until I say you can, darlings~" The demoness placed her latex-covered index finger on Kira's pubes. Slowly sliding her touch downwards, onto Rebecca and along her length. Red savoured feeling her lovers' shared pulse beat at her fingertip.

"What do you want us to do, Mistress?"

"Lay down and let me familiarise myself with my adorable little thralls~"

Kira fell into their favourite bean bag chair, leaning back as they invitingly spread their toned legs. "Like this, Mistress?"

"Mmm, good girl~"

Red slowly dropped to her knees. Rebecca felt her warm breath gently blow across her skin and her piercing eyes gaze into her little girlcock soul.

"Kiss me, babe~" Red cooed, then gently pressed her luscious violet lips on Rebecca's tip. "Mmmmmm~"

Both Kira and Rebecca basked in the gentle vibration of Red's humming, feeling it resonate throughout them. After a moment, the succubus released her kiss and sensually licked a bead of precum off her lips.

"Muh- Mistress! Ah! Nnng… Y-you're so breathtaking!" Kira gasped.

"You're one to talk, cutie~"

Stroking Kira's thighs with her perfectly smooth, gloved hands, Red kissed their girlfriends oh-so lovingly. Kira's moans were music to her ears, glad they were enjoying her teasing as much as she was. Then, Red slid Rebecca past her lips, letting her tongue coil around the head of her submissive's sentient cock like a snake.

Rebecca couldn't see inside Red's dark mouth, but could tell that she had transformed her tongue into a tentacle-like appendage. Red coiled her up and tenderly squeezed her, unbound her and slithered around her, then repeated over and over again. Each precious drop of precum she milked gave Red life: she could tell the cock and her owner were already over the moon and craving climax, but resolved to make them beg for it.

"Mmm! Oh Becca, you're so sensitive! M-my big, lovely dick… Nnng, you're perfect!" Kira cried out.

'Oh Owner! That means so much to me! I love it when you praise me!' Rebecca twitched excitedly.

"Ah! A-and I love it when you call me 'Owner,' sweet thing~" Kira felt their cheeks flush with warmth. "You're my precious girlcock! You're all mine! Owner loves you so much!~"

'I love you too Owner!'

"You two are so adorable, hee hee~" Red giggled as she got to her feet. "Kiss me, sweet thing~" Red leaned over and gently pecked Kira on their lips. Again she snapped her fingers, this time causing the latex between her legs to melt away and reveal her pussy. "I need you inside me, darlings~ Let me keep you warm… safe… loved… Let Mistress take care of you both. But first, how about you kiss my other lips, hmm?~"

Kira eagerly leaned forward to meet Red's cunt with a kiss. Grabbing her rubbery butt with a series of loud squeaks, Kira pulled Red in as they shoved their face into their lover's crotch. Kiss after sopping wet kiss, more and more pussy juice dripped down Kira's face and off their chin. They nuzzled Red's clitty with their cute little nose as their mouth lovingly serviced their new girlfriend.

Red hadn't expected Kira to give more than a single kiss, and so decided to coil her tail around Rebecca so she wouldn't be left waiting.

"Mmm! Ah! Nnng, oh darling! You're so skilled at this! Ah!" Red gasped. “How did you get so good at this, babe!?”

'Owner is so good at using their face, right Mistress? Isn't Owner such a good girl?'

"Your dick is right, Kira, you're such a good girl! Ah! My good girl~"

Red softly gripped the hair at the back of her submissive's head. The gentle crinkling of her latex outfit filled Kira's ears.

"And you're my good girl too, Becca~" Red moaned as she tightened her tail's embrace. "I bet you two feel as though you're right on the cusp of climax, don't you? You want to cum inside me… You want your Mistress to breed you, hmm?"

'Yes Mistress!'

"Yes Mistress!" Kira pried their face away from Red's lovely cunt to reply.

"Then beg me to grant you an orgasm, darlings~"

‘Oh Mistress, please let me cum for you! I’ll be your good girl, I’ll make you feel so good, I’ll fill you up just right, I promise!’ Rebecca howled wildly. ‘Please let us share an orgasm!’

“Please Mistress, please give us release! We need it! And we need you…” Kira whimpered coyly.

“How could I possibly say no to such wonderful thralls?~” Red unwrapped her tail and sat on Kira’s lap. “Your turn to kiss me, Becca~”

Rebecca gently nestled her head between her domme’s labia lips. Precum and pussy juice mixed as the pair shared a wonderfully wet smooch.

“You ready for the plunge, darlings?”

“Yes Mistress!”

‘Yes Mistress! Please let me in! I’m ready!’

Red gingerly slid over the newly minted cock, careful not to overwhelm her senses. Everything went dark for Rebecca as she entered the succubus’ warm, cozy den. She felt so safe, so at home. Being surrounded by her lover, being hugged so tightly and so intimately… The little dick was in paradise. Then, even more pressure squeezed her as Red rhythmically pressed her legs together and Kira thrusted her deeper. The demoness’ soft skin brushed around her girth and along her length, tugging on her skin and stimulating her solid shaft.

“Mmm, what was I going to do again? Ah! Maybe my good girls can remind me~” Red teased, prompting more loving pleas.

“Oh- oh- ah! Oh Mistress, puh-please let us cum! This pressure is killing me! Ah! Ah! I feel like a balloon about to pop!” Kira panted between breaths.

‘Nnng! M-Mistress… Nnng, so hard! Can’t th-think! Need to cum! Please let us cum!’

Hearing her begging subs was about to push Red over the edge, so she snapped her fingers and shattered the magical lock that was sealing away their ability to orgasm.

“I’M GONNA CUM!” Kira burst, hearts practically bulging from her eye sockets.

‘AH! AH! MISTRESS, I’M ABOUT TO CUM!’ Rebecca cried out as her entire form contracted, pumping Kira’s semen through her body. And then, sweet release arrived as she shot pulses of cum in perfect sync with Kira’s thrusts. Rebecca discovered a whole new meaning to a full-body orgasm as her phallic figure tensed and released over and over. She was really doing it! She was being a good girl for both her Owner and her Mistress! Delivering her Owner’s cum for their shared Mistress felt better than anything she had ever experienced before. Rebecca’s throbs slowed, as did Kira’s humping and Red’s squeezing. A warm haze filled all three girlfriends as their climax faded away.

Red pulled herself off the cum-drenched dick, leaking a mix of semen and pussy juice over Kira’s tummy. The succubus slumped onto the bean bag chair with Kira, exhausted but immensely satisfied.

“I love you two so much…” Red whispered, her heavy eyelids about to whisk her away to a peaceful slumber. “You give me life… my good girls…”

Kira pressed their lips on Red’s forehead, and the three of them dozed off to a world of sweet dreams.