[Chapter by Starmage595]

Koneko had braced herself, she knew that Kuroka was likely already had her way with Issei, stopping her was not something she was capable of, but she hoped to prevent too much damage. So, as she stared, at the sweaty bodies as Kuroka prepared for what appeared to be another round, Kuroka stared at her while Issei seemed to be too hazy, almost like he had some kind of aphrodisiac flowing through his body. She needed to be strong to save him.

"Well, seems like we had been found out Issei, nya."

"Hah, Hah, hah."

"Kuroka nee-sama, taking Issei like that is not okay, you need make clear with- "

"Oh, let's not act like we are all good girls here, everyone has opted to take him for a spin, what's so different from me just doing what the others nya."

Koneko knew that she had a point, even she also opted to go underneath Rias to take her first time with Issei, she stuttered a bit.

"W-Well- "

"Ahhh, are you scared that I am going to warp Issei into a sexual deviant, that he will never want to have sex with you all nya."

Kuroka knew she could play with her for a bit of fun, she and Shirone had something that the others didn't, an incestuous threesome, plus the notable difference between their body sizes, plus her ability to change body shape helped. She wanted to see what it would do to her.

"So, where are the others you must have told them where we are nya?"

"U-Ummmm?"

"Oh, you didn't tell them, you came alone, does that mean you planned to defeat me so you could have him to yourself nya."
Kuroka got out of the bed as she sauntered over to her sister, Koneko proceeded to prepare herself, only for Kuroka to get behind her and grope her ass.

"Nya!?"

"So, you decided to join the commando faction, you came here hoping to get to enjoy what I created nya."

"I-I would need to cleanse senpai of whatever you've done to him."

"Wanting to be his princess in shining armor, how nice of you to paint how you want his cock badly, that you want him to fuck you, you see this nya."

Kuroka spread her pussy lips to show Koneko the amount of seed, it was crazy that in just the few hours she had him, yet she looked so full. Koneko felt her body tingle in anticipation. She really wanted it, she wanted to put Kuroka down and hop into Issei's arm to fuck for a bit. But she needed to be stronger.

"Come now, why try to deny what you want. Why not help me get Issei off, use our sisterly bond to make Issei go madder, just imagine the two of us hugging tightly- "

Kuroka enveloped Koneko's body as she gyrated, and they heard Issei growl at what was happened and felt herself get wet, she was starting to get horny.

"And I gyrate my body against yours as we prepared to seduce him, Nya. Don't you want it, want him to fuck you, I bet you really are horny so close to him nya."

Koneko felt her body start to get really warm as she was so close to Kuroka, the scent of him cum mixed with sweat was making her horny. She felt her pussy craving cock, she wanted to do it.

"N-nya."

"Oh, seems like you're starting to drip from your snatch, why deny what you want, when nekomata's want to quell their heat, they will do what they need to nya."

Issei, who was still hazy looked towards the black and white siblings, Kuroka with a lewd smile as she turned Koneko on more and more to help her.

"Look at it, if the others found out, that thick, burly cock would likely have to be shared as we quelled his lust, but right now it's just the two of us with him, nya."

"A-Alone... nya."

"We get to have it just to ourselves, and all the pleasure that comes from that, so why not be bad for a bit nya."

Koneko stared at his cock, the atmosphere was intoxicating, her nose filled with the scent of cum and cock. Her ears and tails she hid from view came out as she bit her lip, Kuroka pushed Koneko onto Issei, Issei and Koneko locked eyes with each other, both were overtaken by their lust as she started humping his leg.

"Nya, s-senpai, I... I need... you."

She reached up to start licking his face, soon Issei went for his neck to start kissing it as she moaned sweetly. Kuroka looked on at her work. She was quite happy as she walked up to join them getting up to his cock.

"Shirone, come on down here, let us share this."

As if she as under a spell Koneko turned around as she let Issei stare at her tout ass, completely bare as she was going commando, staring down his cock, she felt even hornier.

"C-Cock... senpai's cock."

"That's right, why not show me how much of a cock slut you are, how is your technique nya?"

"K-Koneko."

Issei went ahead and started to eat her out, she let out a sweet yelp as she began sucking. She took a lot of it down, it was very quiet to Kuroka as she continued sucking, licking across the shaft letting her tongue get to work. She kept bobbing her head as she let Issei eat her out.

"Oh, looks like you've picked up a lot from the others, so much cock in your throat, but still enough for you sister nya. Thank you for that."

Kuroka decided to face her but towards Issei, giving it a wiggle to as a way to give affection, as she went for his balls and the lower parts of the shaft. The sisterly blowjob was insane to Issei, still very sensitive from the aphrodisiac he wasn't talking much, but brimming with sexual energy as he inserted his finger into Kuroka's snatch.

"Nya, eating my little sister out while fingering me, so much sexual energy, come now Shirone, let Issei know how much you enjoy sucking his cock get louder, moan, gag on his length. He's not looking for good kittens, he's a man who needs naughty slutty kittens who enjoy being perverted."

"Mmmmm, mmmmmm, GASP, ACK, Mmmmmmmm!"

As if she was commanded, Koneko stopped holding back as she started sucking more akin to her. If Issei wasn't on an aphrodisiac, he probably would've tried to stop Kuroka from corrupting Koneko with her perverted tendencies. But he only wanted pleasure to feel good. And feel good he did as Kuroka let her tongue go along his balls, twitching and still so full of seed, she even let her tongue run against his rim, letting him moan from her dirty work.

"Like that don't you nya, what do you want me to do, suck on those big, musky balls or would you rather I tongue your asshole.

"Ahhhh... ass."

"My, so naughty to force a girl to rim you, no girl would so willingly do that, but I am just that kind of naughty, nya!"

Kuroka moved her face lower to bury it into his asshole, licking around it as Issei felt his lower half become numb, completely enveloped in pleasure as the two cats worked on his genitals.

"GACK, SLORP, SLURCH."

"(Nya, Issei's asshole... could lick forever.)"

Issei soon stopped licking and fingering the siblings as he instead held the sheets tightly, his body this close climaxing as he thought about the image of the two girls making out and sharing his seed, it made his cock throb inside of Koneko's throat as she could tell he was coming, she was too focused on it as she continued sucking, hoping to get him to cum down her throat, she wanted to prove she was a good slut who could be just as slutty as her sister or any other girl.

"C-Cumming!"

SPLURT, SPLURT

"Mmmmmmmmmmmphhhh!!"

"Pah, better make sure you let out as much cum from your balls, nya."

Kuroka started to lather his balls to loosen them up. Issei's hips continued to buck as he filled Koneko with lots of his seed. Koneko came just as hard, staining Issei's face with her own cum as she continued to drink down his semen.

"Your cheeks look so stuff Shirone, there must be so much in there."

"G-Guh."

"mmmmmmm."

Soon Issei's climax ended as Koneko pulled off his cock, which was covered in a mixture of saliva and jizz, her mouth still closed as if she was waiting for Kuroka to tell her what to do next.

"Nya, you got so much out of him Shirone, but I had just as much to do with it, why not share some with your sister, nya."

Kuroka pulled her sister in for an incestuous kiss, Koneko opening her mouth as they snowballed cum between the two of them swapping it back and forth. Kuroka and Shirone's display were just making Issei even hornier than he already was, eyes not moving away from the lesbian play as the two made out for a bit, once all his cum had been swallowed the two looked at him.

"Pah, so thick, we have gone at it for so long and yet it is sooo thick still nya!"

"S-Senpai's milk... so tasty, nya."

The two siblings, a yin-yang situation as the difference between the two's bodies were noticeable. And Issei wanted to go in for a round no the two siblings.

"Gives us a quick second, we may have a bit of a surprise."

"S...urpise?"

"Nya?"
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"Sorry for the wait... tadah Nya!"

"W-What do you think, senpai."

The nekomata sisters returned, Both still quite naked with a single exception. A black collar around Kuroka's neck and a white one around Koneko. Kuroka stood with a peace sign as she stook her tongue out, meanwhile Koneko was fidgeting in place, taking quick glances at Issei.

"Right now, we are Issei's slutty little pets, who are in desperate need of your milk nya."

Kuroka flashed a peace sign at Issei whose member twitched at the sight of the two, Koneko instead went straight for Issei's lip.

"Sen...Master, I'm so... hot, please... quell, nya."

"K-Konekmmmmph!?"

She went right for a kiss as she inserted her tongue directly into his mouth, she hung her arms around his neck as she mashed her body next to his, it was almost like she was in heat.

"Ohhhhh, so selfish, this is supposed to be my first time, let me kiss master too nya."

Kuroka proceeded to drag Issei away from Koneko's lips as she started kissing him, Issei got to enjoy the difference, Koneko was still quite innocent as she felt the need to get Issei's attention to open his
mouth, clinging so close she was like a cat who didn't want to lose her masters affection. Kuroka meanwhile didn't care for that, pushing straight into his mouth as she danced her tongue against his, she was more akin to someone who wanted to let you know that she was going to give you affection and you were going to take it.

"M-master, kiss me more, hug me tighter."

Koneko pawed at Issei's chest as he went back to her, the trio as close as they could be as they traded kisses, tongues dancing against one another with a desire for affection. Issei's hands roamed across the two, fondling and earning sweet moans from the two as their kiss continued.

"Ahhh, master... I need your... cock."

"Hee Hee, you heard her, nya."

Koneko and Kuroka turned away and pointed their pussies towards their lover, spreading their pussies lips to entice him.

"Come on, your pets are in heat, they need you to fill them up nya."

"N-Nya, master, please fuck me, I know you won't let me get pregnant let but we still need to practice plenty for when I can finally be bred."

"Hah, hah, hah."

Issei felt his need to be the good master here as he needed to fuck them.

"Why not let Shirone have the first go of it, she's been so patient with her elder sister nya."

Issei went straight for Koneko after being told by Kuroka, she leaned back as he had issei sit while she sat on his lap as she slowly lowered herself on top of him, slowly but each inch was incredible.

"Ahhhh, s-senpai... so thick... so... big."

"Koneko... tight."

She kept bouncing up and down on his member, looking back at him, her eyes slowly lidding as she started to let the pleasure take over.

BOIN

"Hey, don't forget about me, why not have quick suck on your favorite part of the feminine body nya."

Kuroka came up to his side and pressed one of her breasts into his face as he opened his mouth to start sucking on it. Fucking one of them as the other let him suck on her breast was pure bliss, his mind still racing with lust from the aphrodisiac as he sucked. Kuroka enjoyed the feeling of his lips around her nipples, but Koneko was not going to stand by and have the attention taken away from her, so she twirled around as she tapped him to grab his attention before kissing him.

"Senpai. Mmmmm, it's my turn right now and remember Kuroka, I know my boobs aren't big enough, but I promise that they'll be big enough to suck."

"Fuck... so cute."

Issei went for her own nipple on her smaller chest as she moaned sweetly at him doing it.

"Nya, Issei helping you getting bigger boobs by sucking them, but I don't want to be bored so-"

Kuroka pushed her bust right into Issei's back. Now Sandwiched between the two, he chose to focus on Koneko as he played with her nipples, her chest was quite sensitive.

"Ahhh, senpai, nya. Your dick... please pump all of your dick milk inside of me, we need to have plenty of practice for baby-making."

Koneko wrapped her arms around Isseis shoulder, as making it clear that she wanted to kiss for as long as he came inside of her. Kuroka chose to pull back as she instead went even lower.

"Allow me to help you get the most out of him Shirone, nya."

As Kuroka began to work his tongue at his ass, Issei went into hyperdrive in fucking Koneko, their kisses focused on dancing their tongues together as she felt his cock bulge, she looked down to see it
pressing at her stomach, he was at her womb and close to climaxing. She wanted it truly raw, no spell preventing pregnancy, she wanted to fuck him on a dangerous day with high chance of pregnancy. But it was not today but she could fantasize as Issei came hard inside of her, filling her pussy up with her new favorite milk as she came hard, coiling around his dick in hopes of getting more cum from him. Kuroka herself continuing rimming despite the fact that he was coming just because it was addicting to keep on doing it.

"Nyaaaa! Senpai... I love you... I... love... you."

She nuzzled her face into his neck as she went for a kiss, Kuroka looked at the two as she felt her pussy ached.

"Nya, master... I need my own milk now, please hurry up and pour it in."
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"Hah, Hah, Hah."

"N-n-Nya! Just keep fucking me like that Issei... keep pumping inside."

Kuroka laid in the bed as Issei pounded into her pussy, gripping the sheets as Issei held her thighs. Koneko looked at her sister and her senpai going at it like animals. She felt her pussy was on fire despite having just having sex. Mashing her thighs together as she started humping into Isseis back.

"Oooh, what do we have behind you, someone still looks to still be so full of energy.

"Hah... hah."

"Hey why not jump over here and give sis some affection nya."

Koneko listened to her sister, hopping right on top as she played with her much more substantial chest.

"Sis... you're so big nya, such beautiful skin."

"Yeah, these boobs you may have in the future, oh that is right, you will definitely have them from what I have seen of you in shirone mode."

"Hah... Hah... hah."

Issei saw Koneko's body grew a bit as Kuroka mentioned her adult body. She was still nowhere near the size of her sister, but Kuroka still enjoyed the feeling of her bigger tits mashing against them and their nipples. Earning moans out of the two. And Kuroka was getting to enjoy it as Issei's cock got even harder at the duo mashing their bodies together.

"Hey, sis's lips are so lonely nya. Come here."

The two started to make out as Issei continued fucking, opting to feel up Koneko's more filled out ass. Letting his hands sink into them and soon the desire to just spank it came over him.

SMACK

"Ahhhhhhhh! S-Senpai."

Issei watched as her flesh rippled across the smack, she hugged Kuroka tighter as he soon started to fuck the two moving between their snatches, feeling her pussy coil around his dick from the spank.

"Nya, don't forget me Issei, make sure to come back to Kuroka for the feeling of my pussy."

"Grrrrrr."

Issei made sure both nekomata sisters got what they wanted as he continued plowing them.

"Nee-san... senpai finds me sexy right, he is happy with my new body."

Kuroka patted her little sisters head as she smiled at her.

"Of course, can you feel his cock rocking your world, he likely can't wait till he can enjoy this body whenever he wants. I already am looking forward to the day, that we both are simultaneously in heat, where he fucks the two of us silly for days, as he impregnates us and we truly become a family."

Kuroka painted a vivid picture of a day she couldn't wait for, one that stated to invade Koneko's mind.

"I... I would enjoy that, I want Senpai to suck these boobs whenever he desires, then once heat happens, their will be no escape nya. Senpai will give me a so many children during our first heat mating, it will be the best day of my life, one I will remember forever."

Issei proceeded to get closer, making Koneko the middle of a hug sandwich between the three of them. The feeling of warmth was incredible as she leaned back to kiss Issei as she fondled her older sisters tits.

"Nya, thank you for adopting these two perverted pets, we promise to be their whenever you want it, kissing, fucking... breeding."

Issei snorted at the mention of breeding his cock getting even harder at the idea of the two sitting pregnant, snuggled up to them in pure bliss.

"Nya, we found the perfect perverted master sis, one who will do our favorite perverted things, maybe turn us into even bigger perverts."

"Nya, yes, I'm a perverted kitten who will please master whenever she wants."

The Koneko who long detested perversion was long gone, why be it, when Issei adores perverted girls willing to be dirty, she would not only follow Kuroka's teachings on senjutsu, but being an even
better women for Issei, her fiancée and lover.

"G-Going to cum, creampie and mark you two as mine, no other males will dare come after you."

"Yes! Cum inside us, make this yin-yang duo your mates forever, nya!"

"Senpai!"

Issei's hands gripped Koneko's plush ass, plunging deep and giving her a creampie, soon he moved to her sister, and blasted another stream of cum into her. The two sisters felt their minds melting, loosing themselves to the pleasure as searing hot white milk filled them, Issei also kept his promise, as he let his cock spurt large globs of cum across Koneko's back, wanting her sister to get some too
she rolled over, letting Issei paint the two with his cum. Soon it ended as his cock finally subsided. The two girls looked like they had just finished an erotic gangbang porn, but it was a threesome involving two girls and a guy. The two had been claimed by their alpha... and they were happy. Koneko soon returned to her old self, lazily feeling her slightly bloated belly.

"Nya... senpai... filled me... so warm... nee-san"

"Gee hee, That's the kind of sex a real male has, I knew those drugs would turn him into the perfect beast nya."

"Guh, hah, hah, hah... ugh, my head."

Of course, said drug did have a noticeable when it ended it ended hard, as Issei felt all his strength leave him as he fell limped on the bed with a piercing headache.

"Nee-san, look at you, so much- "

"Don't sell yourself short, you're basically bathing the stuff, hey let me have a taste nya."

Kuroka started to lick her sister, basically giving her a cat bath as she proceeded to swallow all the cum on her body, Koneko followed suit, going for the cream lathered across her body in her mouth as
they cleaned themselves up. After that they went over and snuggled up against their lover, deciding to sleep for a bit before returning to the house
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...

...

...

"What is that."

"Hmmm."

"What are you wearing around your neck."

Once Issei was feeling better, they brought him back, everyone had a feeling Koneko joined her sister, but none of them could find them so they couldn't really argue. The following day, while her uniform remained mostly the same, after classes were over and they were in the club, Koneko proceeded to put a collar around her neck.

"This is proof I'm senpai's lover."

"Hmph, makes you look more like a pet."

Koneko proceeded to stick her tongue at Ravel as she giggled to herself.

"Your just jealous that you have nothing to prove your and senpai's love, when I wear this, I feel so warm, and he feels so close."

"That's because you're sitting on his lap!"

"Hee hee."

She proceeded to hug senpai, clearly trying to make Ravel jealous but earning jealous stares from all the other girls.

"Kuuuu, Koneko-chan is hoarding all her affection to Issei."

"Don't worry Asia, we can make sure that Issei gives us proof of his love."

"Yeah! Though I don't really care for the ring, as long as he gives me something more maternal."

The church trio looked on in envy of Koneko's affection, meanwhile Rias simply shook her head.

"Issei, I hope your not forgetting who your legal wife is."

"I-I know, but its- "

"Don't give excuses, you better be giving me double what you gave Koneko and Kuroka."

"Ara Ara, that's not fair Rias, you can't just hog darling all to yourself like that, I feel I deserve as much as you get."

"Akeno, you better not be planning anything."

"Issei-kun!!!!!"

"Huh mmmmph!"

In a flash, Issei felt his face being smothered by a big chest, when his eyes readjusted, he saw Kuroka's black hair, she hugged him even tighter as the rest of the group looked on in shock.

"K-Kuroka... what are- "

"Oohhhh, I just can't forget last night, it was so incredible, I needed a refill If I could slide in."

Rias felt a vein pop in her head as she looked on, one black haired whore was bad enough but two... that was too much.

"Kuroka... kindly get away from Issei this instance, and what is with that outfit."

Kuroka opted to wear the girl's Kouh uniform, though modified to her own preference, the skirt was short enough to reveal her bare ass, meanwhile she wore a shirt with the midriff bare to show her stomach, it was also clearly a size too small since her boobs were straining against the fabric, it looked like even the slightest movement would cause it to tear open revealing her magnificent tit flesh.

"Nya, I just thought maybe Issei would like to go wild inside of me in a classroom, letting his jizz spray around the classroom, it would be our dirty secret nya."

Koneko puffed her cheeks as she held Issei.

"Nee-san, don't be too selfish- "

"Oh, I don't want to hear that, who is currently sitting on his lap and don't think you can fool my nose."

Kuroka flipped Koneko's skirt, revealing what was going on, as she was sitting on his exposed cock. Shocking all of the girls.

"U-Ummmm."

"Kuuuu, I never thought of that."

"To think darling was still in need of relief, I feel like a failure of a wife."

"Issei, mind telling me how long this has been going on."

All of the girls started to crowd around him as he tried to explain, while Koneko just sat in happiness while others tried to pull her off.

"Senpai's lap is my territory."