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You drop your bag and hero gear by your front door. You walk down the hall freezing when you hear moaning from your shared bedroom with Kirishima, moaning that sounds higher in pitch than Kiri’s usual sounds. You feel like your throat is closing as you approach the door hoping what you think is happening, is not. You slowly open the door only to be thoroughly surprised by what you see.
Kiri is on his knees, chest down a pillow tucked between his legs with two fingers stuffing his hole. He’s facing the door but his eyes are squeezed shut as he cries out.
“Y-y/n!” he whines. You watch as shuffles in place and twists his hand, “MOMMY PLEASE” your jaw drops at the nickname Kiri never having used it before. “I’ll be a good boy please- j-just let me cum pleeeease~”
You two haven’t really experimented much in bed due to both of you being so busy with hero work and conflicting schedules, you guys were honestly vanilla when it came to sex. You guys were either too tired or stressed to ever go further than the same old positions and pace. Seeing him so strung out over a couple fingers turns you on to a whole new level.
You carefully and quietly walk over stripping your pants and shirt easily before climbing on the bed behind him. He jolts up but you wrap your arms around his waist and press your lips to his ear calming him down once you speak.
“Mommy's home baby” You press him forward so his chest is back against the mattress.
“Y/n~”
“Oh no baby it’s mommy right now.”
“ Oh fuuuck, yes mommy~”
“I’m gonna make you feel good okay baby?”
“Please!” he whines as you lift off of his back and tug his fingers out, quickly replacing them with three of yours. You pump your fingers in and out quickly making him cry out. You groan at how warm he is and how he clenches around your fingers when you rub against his walls just right.
“What do you want baby”
“Fuck me please fuck me~ I-I bought a thing, under the bed please~ ”
Without stopping you reach your free hand down and dig under the bed until your hand finally grazes silicon. Your eyes widen as you pull it out and realize what it is.
“Holy fuck you were planning this?” you ask, holding a decently sized strap on in surprise.
“Y-yes!~” he moans, “N-now fuck me stupid please~” he wags his hips as if to tempt you and tempt you it does. You pull out your fingers making him whimper but he doesn’t get too upset knowing what’s to come. You quickly hook the strap to yourself and grab the lube from the top drawer before coating the toy. You place yourself at his entrance with one hand and hold his hip with the other.
“You ready sweetheart?”
“Yes fuck get in me already please” he pleads.
“Patience is a virtue baby” you hum
“ Mommy please”
You decide to take mercy on him and push into the hilt. His eyes roll back and his body melts into the mattress.
“I-I’m ready~” he speaks up, his head turning to look back at you. You can’t help the possessive noise that leaves your throat without permission as you take everything in. His face is red and a gooey smile is on his face as drool slips down his cheek. You also take a moment to admire the view of his strong back arched and his juicy ass in the air. You enjoy the way his cheeks are thick enough to hide where the strap is buried inside his hole, basically swallowing the toy.
He whimpers as you check him out, “M-move please” he whines when you still don’t move.
You hum in amusement deciding to tease him, “Okay sweetheart I’ll move”
You move slowly, taking it at a snail's pace and making him groan in annoyance and need.
“ C’monnnn move faster” he huffs.
“That's not how good boys ask for things” the obvious teasing in your tone makes him groan again. You keep moving slowly, angling your hips to press the toy tantalizingly against his inner walls making his sensitivity slowly spike.
“Please mommy~”
“Please what, what do you want?” you tilt your head a mean grin on your face as you look down at him. His bottom lip is jutted out in a pout and his eyebrows are furrowed.
“P-please fuck me faster mommy pleaaase~ I need it so bad”
“Hope you’re ready for me baby boy” that’s all the warning he gets before you start pounding into him. His body lurches with each thrust, his hands grip the sheets, tearing them as his quirk activates in his hands and arms.
“Oh my god mommy fuuuck~!” his thighs are trembling as he’s pounded in to. Kiri’s eyes are squeezed closed moans and whines leaving his throat with every thrust. You can see his ass jiggling back with every thrust and you groan.
“This better honey?” your voice has a teasing tone as you look down at him.
“YES! Yesyesyes sooo much b-better~”
You love watching him from behind but the need to see his face as he’s wrecked is growing. Giving in to the urge, you pullout making him cry out, “Nonono please please! I’ll be a good boy!”
“Shh I got you baby, just changing positions” you grip his hips and quickly flip him so he’s on his back and god it was so worth the pause. His face is flushed and his eyes are glazed over with lust as he looks up at you.
“Hold these up for me baby” you move his legs back by the inner crease of his knees and he eagerly replaces your hands with his own to keep them held up. You wet your lips when you look down and see his hole clenching and unclenching around nothing, just begging to be stuffed again. His stomach flips as you grin at him and put the tip of the toy back at his entrance.
Just as he opens his mouth to beg you to go inside again you slam into him and directly into his prostate making him cry out loudly. You watch in awe as his eyes roll and his back arches, his toes curling at the sensation.
“O-o-oh fuck” he groans as you pound into him again. You move forward replacing his hands with your shoulders as you fuck him into a mating press now.
“Feeling good sweetheart?”
“YES!” he cries out his jaw going slack as you start thrusting in deeper thrusts, grinding against his prostate as you push in. His heels dig into your back but the pain is worth it when you see the obvious pleasure written on his face. His eyes squeeze shut as he’s overwhelmed with pleasure. Needy sounds leave his lips every thrust. His hands reach up and pull you into him as he cries out your name. You lean down nipping at his neck and chest.
“You’re such a good boy for me Kiri” you pull back so you're hovering over him as you pick up the pace and harshness of the thrusts.
“I’m a g-good boy?” he whimpers, opening his eyes which are teary as he looks up at you.
“Yes baby you’re so good for me, such a good boy” he whines in the back of his throat and you cup his face rubbing your thumb over his cheek.
“I-I’m a good boy” he hiccups his pupils are fully blown and the once held back tears spill over. A love drunk smile is on his face as he looks up at you in adoration.
“Yes you are baby” you coo at him as he keens.
“I’m a good boy!” he cries out his legs shaking heavily from where they were wrapped around your waist. His hands are scratching down your back as his back arches.
“Close!~ close mommy I-I’m so close!” his eyes cross at the pure pleasure and the heat swirling in his stomach.
“Beg for me baby, beg for me to let you cum” your tone is dark but breathy as you try to keep up the pace.
“Please! I’ve been a good boy just for you mommy please~ I’m your g-good boy, I need to cu-cum!” he sobs out.
“Go ahead and cum my baby” he immediately replies with a wail of your name and his spend shoots up his chest. You groan at the blissed out look on his face as he comes down and you slow your thrusts.
“ I’mm a-a good boy m-mommy” he slurs softly his voice laced with satisfaction.
Eventually your panting stops and you carefully pull out which makes Kiri whimper quietly. You lean down and place random sloppy kisses all over his face making him giggle softly. You brush his hair out of his face as you hover above him. Finally the blissful haze lifts and Kiri gets slightly nervous especially remembering this wasn’t really talked about. He knows that if you weren’t comfortable with this you wouldn’t have said anything let alone played along but intrusive thoughts have a mind of their own.
“Y-Y/n I’m uh-”
“Nope you’re not apologizing or anything like that for liking this ya hear me?”
He chuckles softly a small smile appearing back on his face, “You know me so well”
“I try. I hope you know I liked today” you smile laying down on your side next to him and tracing shapes onto his chest. Your heads on your hand as you look down at his smiling face.
“You did?”
“Of course love, and if you want to do things more like this I’m in. Or if you want to experiment more, with anything, I’d be very down to try more with you”
“Yeah?” he sounds giddy with a grin on his face as he looks at you.
“Yeah, anytime you want, okay? All you gotta do is ask me okay sweetheart?” he nods rapidly before leaning up to kiss you eagerly. You melt into the kiss and it leads to a soft makeout as you hold each other. Eventually you too pull back and he pulls you onto his chest.
“Let's sleep love” he says quietly, the vibrations sounding through his chest and into your ear. You nod not realizing how tired you were until you were pressing against him being warmed up and cuddled.
“Love you Eiji” you murmur.
“Love you too Y/n”
You both drift off quickly, a new found comfortability with each other warming both of your hearts, along with the excitement of new encounters on the way.