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When Katsuki and Denki finally announced that they had been dating for a few months now, most of the class was in various states of shock. While it was clear that Katsuki had a soft spot for his friends, everyone had been under the impression that if the blonde were to date anyone, it would be his redheaded best friend, Kirishima. Katsuki let his best friend get away with a lot of shit that he didn’t let others do. But, if anyone had been paying attention, Denki got away with so much more once they got together.
And now that they are out? Denki took full advantage of that.
Before they were out, Denki kept his teasing touches and words behind closed doors - knowing how flustered his boyfriend got mean that it was easier to get caught in public if he didn’t, and he knew that that was not a way that Katsuki wanted to get found out. But now? Denki held nothing back.
All the little touches and kisses now came tenfold. Movie night? Katsuki was dragged onto Denkis lap for cuddles (the electric blonde was fucking strong when he wanted to be, Katsuki learned after a helpless struggle the first time his boyfriend did it). Study sessions with the squad? Denki was glued to his hip, always finding some way to touch him. Training? Kisses for anything and everything done. And the locker rooms...oh the locker rooms were the worst. Denki blatantly staring at Katsuki as he changed, wolf whistling whenever he took his shirt off or making bedroom eyes as he walked out of the showers. If Katsuki weren’t so stubborn, he probably would have started changing in the restroom stalls.
But the worst had to be the abused use of pet names.
Katsuki had his chosen few for his electric boyfriend: Lightning Bug or just straight up Bug, Sunshine, and Pikachu. But Denki? Denki called him anything and everything under the sun. Honey, Sugarpie, Pumpkin, Love, Sweetheart, the ever so classic Blasty, Cherry Bomb, more. But Katsukis begrudgingly admitted favorite had to be Baby. The first time Denki had called him up had been more of a tease than anything else. But the way Katsuki had melted at the word was most certainly not.
Neither of them knew quite why the explosive blonde practically turned to goo from that single word, but damn did Denki have fun using it. Thankfully, he did mostly keep it in private - the possessive side of him claiming that soft, submissive side of Katsuki for himself.
And keep it he did. No one, with the exception of Shouji, quite knew what happened behind closed doors and that’s how they wanted to keep it.
And so after a rough week, with most of the class away for the weekend, the duo holed away in Katsukis room, Denki with the full intent of spoiling his boyfriend rotten.
It started out with small touches. While Katsuki would deny it till his dying days, the sandy blonde was not a morning person. Though, Denki did love his soft, grumpy boyfriend in the mornings. Denki could get away with so much more in the mornings too. Spoiling his love with kisses and cuddles for a sweet wake up call. And that’s exactly what he did. Pulling Katsuki into his chest and nosing into soft, gravity defying locks before dropping his head and kissing his sleeping boyfriend's forehead. He slowly moved down, kissing cheeks and his nose, lips and then chin, before nosing at Katsukis sensitive neck.
Oh, was that the fun bit to mess with.
This is when Katsuki started to stir awake, a soft moan escaping as Denki brushed his lips over the blonde's pulse. Denki could not only hear his breathing pick up, but feel it as well. The steady beat quickening to a fast flutter under his lips. Denki merely chuckled as another breathless moan left his lovers lips and Denki started to nibble the skin in response, happy he no longer had to hide the marks he loved to give Katsuki.
Katsuki let out a gasp as teeth met the sensitive skin of his neck and bit down, “Fuck, Denki, s’too early for this.”
Denki pulled away with another chuckle and lifted his face to Katsuki, “It’s never too early to spoil you, Baby…”
Katsuki let out a whimper at the word, face going as red as Kirishimas hair before he narrowed his eyes and bopped Denki on the back of the head. Denki couldn’t help but laugh before diving back into Katsuki’s neck and quickly nibbling on a new spot before biting down into the skin, causing Katsuki to suck in a breath as fingers tangled in his hair.
“You motherfucker-”
“Mmm, not quite Baby,” Denki murmured against soft skin, “your moms not half as pretty as you are.”
Katsuki sputtered at that, clearly not sure how to respond. And while Denki had to admit that Katsukis mom was fairly attractive...he didn’t much like her. He’d take Katsuki any day.
Getting back to work, Denki continued to mark up his boyfriends neck, relishing in the little whimpers the normal explosive boy made as he writhed against him. Soon enough, Denki moved to his collarbones and bare chest. Gods, Denki was so happy when he found out Katsuki slept only in boxers more often than not. Made mornings like these so much easier.
It wasn’t long before Katsuki started to rut up against Denkis stomach, the sound of his whiny moans filling the room as Denki marked up his skin. After a short while longer, Denki pulled away with a sigh and moved back to Katsukis lips. The boy soft and pliant against his lips. The kissed for a while, soft sighs breaking moans and the sound of lips against lips. It wasn’t until Denki slipped his fingers into Katsukis boxers, slowly teasing his hole that Katsuki started to desperately grind against him in search of release. Denki finally pulled away, taking a moment to look over his boyfriend's face, flushed cheeks and swollen lips making Denki grin and he pecked Katsuki again.
“You want more, Baby?”
Katsuki whimpered loudly, “Please? Please, please, please?”
“‘Please’ what, Baby?”
“Please fuck me, Sunshine?”
Denki let out a groan, “Oh good boy, baby. Asking so nicely, how can I refuse?”
Reluctantly pulling his hand out of Katsukis boxers, Denki reached around and felt around the pillows for where they hid the lube. After a few moments of searching, his fingers finally grasped around the bottle and Katsukis whines grew more desperate.
“Shhh, Baby. Don’t worry, I got you.” Denki murmured, pulling Katsuki into a deep kiss before rolling them over so Denki was on top. He slowly kissed his way down the blondes body, nipping and biting and leaving marks when he felt like it. Katsuki was a true mess by the time Denki reached the band of his boxers. Katsukis cock was straining against the fabric, a dark spot taking over the front where precum had spilt. So much that if Denki didn’t know what his love was like when he came, he would have thought that he already did.
“Oh Baby, look at how wet you are for me...such a beautiful sight you make.”
“Fuck, Denki, please fuck me. Please-” Katsuki gasped out as Denki yanked his boxers down, little cock bobbing free and hitting the explosive blondes stomach with a wet smack. Katsuki was quick to grab his legs, pulling them up and presenting his hole to Denki with another whine. And Denki lost any ounce of patience he had at that, making quick work of grabbing the lube and dowsing his fingers in it before fingering Katsuki open.
It wasn’t long before the blonde was open up enough for Denki to sink in. And sink in he did after yanking down his boxers enough to free his dick, gods, he did not realize how hard he was, Denki quickly sunk into his love. Both of them groaned at the feel of the other - Denki wasn’t sure if he would ever get used to how tight his boyfriend always seemed to be.
After that, things went fast. Both were two pent up at that point, desperate moans filling the room as skin slapped against skin. They could have lasted seconds or hours, neither were sure of time at this point. But soon enough, Katsuki fingers were digging into Denkis back, dull nails leaving faint pink lines across the electric blondes back, pulling Denki down to bury his face in his neck.
“Cum-cumming - Denki - cumming!”
Denki growled, “Cum for me, Baby.”
And cum Katsuki did, his back arching beautifully under Denki as his head threw back in a silent scream - narrowly avoiding the headboard in the process. He clenched hard around Denki, momentarily sti;ling his movements, buried deep inside Katsuki. Eventually Katsuki unclenched enough for Denki to move again, fucking into Katsukis sensitive hole and biting at his neck in the process.
“Good boy, Baby, good boy. Came so good for me…” Denki uttered against bruised skin between kissed and bites, “M’almost there, Baby Boy.”
“Ple-please, fill me up-”
“Always, Baby.”
And with a few more thrust, Denki came buried into Katsuki, teeth latching into his shoulder as he did. Katsuki whined, long and loud in Denkis ear as he did, weakly clenching around him. Soon after Denki was finished, he rolled them over, letting Katsuki lay on top of him, soft cock slipping out. Katsuki whined again at that, clearly not ready to be empty so soon. Denki let out a soft chuckle, reaching around and plugging up Katsukis hole with a couple of fingers.
“You good, Baby?” Denki asked after a while, not even sure if his love was awake or not.
“Mmm...m’good. Sleep now.” Came a sleepy response.
Letting out a small laugh, Denki relaxed into the blankets, “Okay, Baby, sleep now.” And moments later, the body on top of him fully relaxed. Once Denki was sure his Baby was fully back asleep, he carefully slipped his fingers free and wiped them on the blankets. They had plenty more free time to fill him again if he needed it.
After all, the weekend was just starting.