Disclaimer: I don't own My Hero Academia

A/N: Things are about to get steamy!

Kirishima had never been happier in his life. He was pursuing his dream of becoming a pro hero and living up to the legacy of his idol, Crimson Riot. He loved his classmates (most of them anyway), his classes and their new dorms. But the best part was the one he wasn't allowed to discuss with anyone; the fact that scary, angry Sir Blasty was in love with him and they were secretly dating.

Bakugou had, to put it lightly, insisted that they keep this on the down low for a while. But Kirishima didn't think it was out of shame. Sure, there were still people out there that would hate their relationship purely because they were both males, but Kirishima didn't think anyone in their class would object.

No, Kirishima was certain that Bakugou would be like this no matter who he was dating. His beloved angry boy could handle anything you threw at him…except feelings. But that was ok, he was in no hurry. Slow and steady.

Bakugou was an emotional wreck. He'd never had romantic feelings for anyone before, and he'd declared that he likely never would again. It was Kirishima or nothing and that was absolutely terrifying to him. Despite being a complete novice to romance, and relationships in general, even he knew you don't tell your first boyfriend that he's the one after dating for less than a week.

He was still performing well enough in class, but acting natural was getting harder, pun intended. So far, all he'd allowed was holding hands in the privacy of their dorm rooms and some chaste kissing. And Kirishima accepted it without question, beaming at him in a way that never failed to make his stomach flip. Kirishima wasn't the problem.

After the fifth night of waking to the sound of popping, Bakugou wanted to scream. He was sweaty, he was hard, and he was embarrassed. Sixteen years old and only just getting bitch-slapped by his hormones now. How pent up had he been all this time?

With a fist in his mouth to stifle his groans, Bakugou finished what was turning into a nightly routine, imagining his innocently sleeping boyfriend next door.

Kirishima wasn't sure how much longer he could play dumb. Bakugou didn't seem to understand just how thin the walls were. Every night, every night, he would hear Bakugou moan his name, accompanied by a series of mini-explosions. The thought of his poor boyfriend, suffering his sexual frustration in silence was enough to bring tears to his eyes.

By now, this had been going on for two weeks and it was turning into a routine for him as well. Go to sleep, wake up at approximately one in the morning, listen to Bakugou's sex noises, tend to his own needs, go back to sleep. Repeat the next night.

Come on, urged the devil on his shoulder. Go knock on his door. He wants you! You are his boyfriend after all!

Kirishima rubbed his chin thoughtfully.

No, no, no! the angel on his other shoulder piped up. Just because he wants it doesn't mean he's ready. To ambush him when he's vulnerable like this just isn't manly!

Kirishima groaned and buried his face in his pillow. Of course, the right thing to do would be to let Bakugou come to him, but that might not be for a very, very long time. Perhaps what he needed was some…encouragement! Yes! Gentle coaxing. That was ok, right?

Kirishima made his move on Saturday. The two had been hanging out in Bakugou's room and reading comic books, as always, they had gravitated towards each other and eventually the books lay forgotten on the floor.

"Oi, Shitty Hair," Bakugou growled. They were horizontal, Bakugou lying on his back and enjoying the lavish attention Kirishima was paying to his neck.

"Yes?" He asked innocently, lifting one of Bakugou's hands and placing it against his scalp. The blonde-haired boy muttered something unintelligible, distracted by running his fingers through the red strands. It was enough to make Kirishima want to purr. His hand delved under Bakugou's tank top, kneading the hard muscles. Bakugou's back arched and a hiss escaped his lips.

"Shitty Hair!" he growled again. Normally, he would have taken that as the signal to back off for now, but his tone didn't contain the usual bite. Kirishima had to fight to keep from grinning. That gave him an idea!

Sighing dramatically, he dropped his head to Bakugou's shoulder.

"How long are you going to keep calling me that?" He murmured next to Bakugou's ear. He leaned closer, so his lips brushed against the other boy's earlobe.

"Wouldn't you rather use my name? Ei-ji-rou."

Bakugou shivered. His lips were pressed tightly together, and he had Kirishima's shirt in a death grip.

"I can use your name, right? Katsuki." He nibbled Bakugou's ear. A loud moan escaped Bakugou's lips and he clapped his hands over his mouth in horror, blushing furiously. It was hands-down the most adorable thing he'd ever seen. Kirishima swept his hand over Bakugou's solid abs and up to brush one of his nipples. It immediately hardened under his touch.

"Do you still hate my teeth, Katsuki?" He pushed aside Bakugou's hands and captured his lips in a searing kiss, catching his bottom lip and gently tugging on it.

Both of Bakugou's calloused, sweaty hands found their way to Kirishima's head and gripped him tightly. His red eyes were half open, but they burned with intense want. His cheeks were flushed a deep red and his breathing had turned ragged. An arousing sight anyway, but the fact that it was Bakugou panting and writhing beneath him…well, can you blame him for feeling proud?

"Bite me, you bastard." Bakugou ground out. Kirishima decided to go ahead and take that literally, clamping down on the junction of Bakugou's neck and shoulder. Encouraged by his barely-concealed groans and the fists in his hair, Kirishima took him literally again and again.

"You're fucked up, you know that?" Bakugou grumbled, examining himself in the mirror. They were both bruised and flushed, but the blonde looked like he'd been attacked by a horde of cookie-cutter sharks. Kirishima grinned and shrugged, too tired and distracted by the sight of Bakugou in his underwear to care.

Not that he was going to complain anyway, but Sir Blasty had given as good as he'd received. His scalp was tingling, and his body was dotted with scratches and minor burns. He opened his arms as a silent invitation.

With his features scrunched up in a petulant expression, Bakugou climbed into bed and snuggled against Kirishima's side.

"Tell anyone and I'll kill you."

Tell them what? That Bakugou had a kink for being bitten? That he was a cuddler? That his nipples were sensitive? He had no intention of sharing anything.

Kirishima decided he could live with this. Bakugou could keep his pride, and have the class think he didn't have a soft side. In return, he would get to see the sides of Bakugou that no one else was permitted to. The cuddles, the vulnerability, the hurt little sounds he made when he felt good; those were all for him.

He was tired, so he expressed his agreement by kissing Bakugou's temple before drifting off to sleep.

A/N: This chapter was inspired by this excellent fan art by AderiAsha: www. deviantart aderiasha/art/KiriBaku-Kissess-and-Bites- 732610014 (take out the spaces). Enjoy!