*Story preview* Dragon's Heat-DxD- Chapter One- Issei H x Rias G, Koneko T- For Lbr3

**Everybody in this story is above the age of eighteen years old*

Chapter One- One Heated Afternoon of Dragonic Lust- (Issei x Rias  Gremory, Koneko  Toujou)

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Following the original timeline of events in the DxD universe...

Ever since the events following the latest Ratings Game match between the Gremory Peerage and the likes of her rival, Sona Sitri, Rias Gremory had started a burgeoning life of sexual deviancy and uninhibited expression with her equally virile partner Issei Hyoudou. Their love had blossomed as far back as Issei defeating Riser Phenex in the challenge granted to him by the girl's older brother following the girl's loss in her Ratings Game match against Riser some time ago. For a while since that time, not much had happened between the two as they were still discovering their feelings for each other amid the nonstop chaos of their everyday lives serving as Protectors of the human realm as well as operating as 'Devils for Hire' for any who would form a contract with them. It was just as business as usual, with th everyday chaos of having either Akeno, Asia, Xenovia, or anyone else practically throwing themselves as Issei out of mutually obtained affection for the Red Dragon Emperor Horndog. It had been a lot for the virile young Dragon to try to hold himself back and save himself for the dream Harem he always aspired to have even though he fell in love with Rias first and wanted to marry her one day. Until then, many pairs of large buxom breasts, be it Koneko's perky mounds or Akeno's large head-sized tits, always pressed into Issei's body and made him nearly give in to his lust right there on the spot. Some Days it was Xenovia asking him to breed her or Irina deciding to confess that she always wanted him to sleep with him during their stay at the Kuoh Academy as new students. Everywhere, all at once, Issei was thrown into temptation and resisted for the sake of his goals of giving his first time to Rias as well as obtaining his harem all in the same swoop. Thus, all those pent-up urges of lustful hunger directed toward all the girls had built up ever since he started to repress them till the day Rias and Issei finally became an item together.

The two hadn't yet decided on marriage, but the idea was there in their minds for the future after they left Kuoh for the greater worlds beyond in the next step of their lives. Thankfully, Rias was every bit as eager as Issei to indulge in his pent-up sexual energy by giving herself to him every now and then between duties performing for their clients or safeguarding the mortal realm from the likes of Fallen Angels or rogue devils. Rias would demand Issei drop his pants and take her from behind on one day then surprise the horndog by getting down on her kneecaps and blowing him in public while using a spell to make herself invisible, she'd even add spice to these raunchy acts by smothering his rod between her massive breasts since he liked women's tits so very much. It made Issei virile and every bit as excitable as a wild animal on the prowl, but Rias picked up on something odd about Issei's behavior due in part to her knowledge of Red Dragon Emperors of the past. Somehow, she felt he was holding back his truer self and not yet acclimated to the raw power of his Gauntlet, but she initially wrote that off as suspicion and needless paranoia and simply continued to smother his cock strongly between her breasts until he was ready to explode in her mouth.

With that day, came another where they'd engage each other someplace randomly and go at it like horny young newlyweds channeling all their pent-up passion for each other, but what Rias suspected and didn't know was that Issei's true libido had not yet surfaced. Being the Red Dragon Emperor came with more than a few Quirks that one could call 'chaotic' and she was about to see it for herself soon when a certain 'affliction' came over her boyfriend....

...on a day like any other, there came to be a particularly distressful Issei yearning for more than just the usual 'mild' bouts of sex between himself and his lover. He needed to breed. Now.

....

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One day, on an evening just outside of her mansion where her entire Peerage group of friends had come to stay over the weekend in the Underworld on Vacation, was Rias Gremory looking out at the balcony of her bedroom. She had been wearing a modest yet highly sexy sleepwear lingerie consisting of a simple lampshade around her fluffy brasserie top with a matching red-lace thong worn over her sex attached to a pair of tiny garters connected to her stockings. Her bust stuck out more noticeably than before and her figure remained every bit as sublime with curves and fertile shape thanks to her Devil genes. Rias was a beauty among beauties, always had been, and will forever be as she had looked on at the dark sky beyond the horizon with a smile on her face. She was gripping the railing of the balcony, blushing a color as red hot as her blazing mane of beautiful wavy hair, hoping for Issei to come here soon for she was in need of sex more so than ever tonight. 

"Ooohh, he'll be here any minute now and just ravish me like a darling Gentleman. I just know it. My boyfriend never disappoints,  heheheh. And Issei-Kun is the horniest man around, I wonder what seeing me like this will do for him since he was already so fired up the first dozen times we've had sex. I can hardly wait....!~" Rias said to herself in thought, twisting a lock of blazing red hair around one of her fingers and whistling to herself till she decided to leave the Balcony and wait on her large Queen-sized bed for Issei to arrive. She knew his patterns by now and anticipated when the horndog would show up, feeling moist and eager already.

Knock knock knock..!

"Ah, that's him...! I just know it! Ahem...I'm coming, Issei-Kun.~" Rias said aloud, feeling giddy as can be. She practically hopped and skipped her way over to the door, wishing to surprise Issei by hiding behind its surface when she felt something was wrong after hearing a rather feral sound coming from beyond it.

...

Grrllggghhh..!

"Hm? Issei? Is that... really you?" She asked carefully, narrowing her eyes in slight confusion and wariness in case this was a surprise attack on her by one of their enemies. Carefully taking a stance and preparing to fight back with Magic, Rias reached forth to undo the magical locking mechanisms on her door before pulling it open slowly. She peeked over the edge from the side to see that it was indeed Issei himself and no one else, making her relax a bit till she saw that he was hanging his head low and breathing rather loudly. 'Something...appears to be wrong with him. I wonder what it could be.....could Issei be sick or under the influence of some spell?'

She pulled it open all the way and relaxed somewhat as she saw him huffing strongly with a bit of drool leaving the corners of his lips and eyes looking dilated as though he was in some kind of trance. Issei was wearing his usual clothing of a dark red shirt worn underneath his darkened jacket and a pair of matching color pants, yet he was slightly hunched and showed Rias that his eyes were glowing red.

"Must...have...it....now..! Must....take you...! Breed you...! Rias...! Rrgghghghhhhh! Help....me...! It hurts...to control...unless I let it out...aarrghghhhh!" He howled gruffly, stomping into her bedroom and frightening Rias a bit till she showed her worry by clamping her hands around his shoulders in concern.

"Issei..! Talk to me..! What is wrong...? I..I should call Rossweisse and see if she can help identify whatever is going on with you right now. You're...looking unwell, pent-up...and....almost feral..." Rias pointed out and held onto Issei's body before guiding him to her bed. She sat him down and tried channeling some of her magical energies into her palms in hopes of detecting some kind of influence over Issei. He was not only pale but also obviously stressed out to the point a few hairs were out of place and his eyes roamed all over Rias's half-naked body when his lustful instincts were starting to kick in. 'Hmm, he seems normal enough, maybe he's worn out from the trip here? No, that couldn't be right. Issei-Kun is always so full of energy and active whenever possible, so what....could be doing this to him?'

!

"Hah...Issei-Kun...something...is affecting me after touching you right now. Mnhgmghhmm! Your scent....your....musk...everything about you is driving me crazy..! Uuaaaghhhh!~" Rias suddenly let out as the effects of his undiscovered field of Pheromones decided to kick in with strength, making any living female around him within a dozen feet or so go into 'heat' just as Issei was in right now. Rias widened her eyes as she looked into his green eyes, seeing that he was grinning lasciviously when bringing himself closer to her and grabbing onto her waist with fingers feeling up her sides. She immediately shuddered in response and felt her body light up with lustful needs with her legs bucking together and breasts feeling ten times more sensitive than before. "Gaaaaghhhh! Mnghmmm! Issei...! You...this isn't an affliction, is it? You're in...some kind of state of heat...! W-why didn't I figure it out sooner...? Mmnhmmmm!~"

Issei was huffing louder now and feeling his cock bulging through his trousers as he started to obey his instincts, sliding the straps of Rias's lingerie top down her slender shoulders till the cups of the girl's brasserie spilled off her gigantic breasts. Those E-cup-sized gems just bobbled freely out into the open in front of him with nipples quickly becoming erect thanks to his Pheromone field, furthering Issei's own lust as he lunged his lips right at his girlfriend's right tit with eager little fingers from his left hand grabbing onto the other. 

"Hrraaggghghhhhh! Schlup..mnghgmm..sllrpp..shlurppp....sllrp.. mnghgmmmhh! Opppaaaiiii..!" Issei growled into her chest the instant he started sucking hungrily on Rias's nipple, twisting the other one in a pleasurable way as he caused a surge of pleasure to well up from inside of the girl before she threw themselves back together onto the bed.

"Aaaaaaagghghhhhhh! Mngghmmhh! Ooohhhhh! Issei-Kun! Aaahhh! Y-you.. usually start with a gentle kind of foreplay...b-but this....ooh my....goodness..! Uuaaghhhh! You're outright primal..! Mnghmm! Oohhh...d-don't stop though...! Play with them as you like...Issei...!~" Rias cried out in ecstasy, feeling her boyfriend's lips gingerly suckle on her breast while fondling the other, stimulating her in ways she'd never felt before as everything she could feel was amplified through their touch. His lips strongly pursed themselves around her right nipple, hungrily sucking it into his mouth and deliberately squeezing those lips around some of the most sensitive places around her areola. Likewise, his fingers expertly kneaded her other tit, enjoying its bounciness as it swerved around from inside of his palm with Issei making Rias melt on contact with this primal form of foreplay without knowing they had an audience right now. 'Oooohhhhh...! Isseeeeiiiii..!~'

"Mngghmmmhh...Sllrpp..shlurpppp..sllrpp...shlurppppp! Aabngmghhmm! Breasts..! Rias...! Must...breed..! Mnghm...mmmnbhm..mmnbhm!~" Issei moaned between her mounds as he hungrily suckled her tit, tugged on her nipple, and fed on her breasts together when he decided to alternate between them without realizing a pair of amber-colored eyes were watching them from the crack in the door.

...

"Oh...wow....! I..I came here because I was following Issei-Kun's....Shudders..scent from earlier after smelling it. It..felt different from what he usually exudes, but I never expected to see this." Koneko Toujou said quietly to herself as she watched silently from outside of Rias's bedroom, wearing only her basic, white sleeping lingerie which showed off her highly petite body in a sexual form.