I'll try to make it detailed enough to give you fanservice!
Btw I TOTALLY SUCK AT 3RD PERSON POV 😭

3rd Person POV

Katsuki pinned Izuku's arms above the shorter boy's head and crashed his lips against the boy's soft ones.

The ever impatient got so drunk with the greenhead's luscious lips and roughened up his pace. Izuku let out a deep groan, a chance for Katsuki to slip his aggressive tongue inside Izuku's mouth. He explored the short one's mouth relentlessly, gaining a deep and loud groan sending vibrations to his mouth down to his crotch.

He felt himself twitch at the sensation. Izuku squirmed and tried to wiggle himself free but with no avail. Katsuki felt something hard poking and rubbing his own clothed erection making it even harder to restrain himself. He grunted against Izuku's mouth and grabbed the greenhead's erection, stroking it through the cloth. Izuku yelped at the sudden action but moaned loud nonetheless. Katsuki got even excited he yanked down the other's shorts and reached inside. Izuku tried to fight for dominance in the tongue clash but failed. The blonde is really strong.

Katsuki continued to stroke and rub Izuku's twitching dick, taking note of it's unbelievable length. The boy has something to be proud of after all.

The heated session continued for almost an hour. Both of them panting and grunting. Katsuki finally got tired of the tongue clash he slipped his tongue out and let out hot breaths on Izuku's lips. He felt like staring at someone else. The boy's eyes before him was nothing like the ones he knew since childhood. It looked corrupted and lidded with carnal desire.

Izuku was staring at him blankly, traumatized even. His breathing was shallow, his lips slightly ajar. Katsuki suddenly felt tears forming at the corner of his eyes, tempting to stream down his flushed cheek. He gently rubbed his thumb on the boy's swollen lips gaining a flinch from Izuku.

It shattered his guts. Before his eyes could betray him, he quickly and carefully lifted Izuku bridal style and laid him on his bed. He embraced him, kissing the top of the boy's head.

"Ka--cchan.." Katsuki heard the exhaustion on Izuku's tiny voice.

"Don't talk. Rest now." He cuddled him til they both fell asleep.

It was late in the afternoon when Katsuki woke up. Surprised of what's in front of him, he struggled to remember what happened and the tears instantly rolled down his cheeks.

I fucking violated Deku. Shit. I'm so fucked up.

He let out a sigh and slowly slipped out of the bed and walked towards the kitchen. He tried to cook but his body wouldn't cooperate.

Feeling defeated and drained, he succumbed to his despair and guilt.
He couldn't stop sobbing until a soft hand touched his shoulder. He abruptly wiped his tears away and grunted, 'What?"

"Kacchan..you're such a tsundere." He faced him and saw a smirk playing on Izuku's lips.

Katsuki

"Kacchan..you're such a tsundere." I turned to face him and saw him smirking.

"Huh, Deku????!!!! You think you can be so cocky now??!"

Deku just answered me with a giggle.

I grabbed his hand and inched my face towards him. He looks so surprised I almost laughed.

"Let's go out."

"H-Heh??? Kacchan??"

"Why the fuck are you blushing??"

"W-well.." He touched his pointing fingers together, looking at them and avoiding my eyes.

"Whatever, Deku. If you don't want to eat, then don't. I won't fucking join you in starvation!" I stood up and was about to walk away when he tugged hard on my shirt.

"Okay okay." He replied with his face beet red.

>>At the cafe

I sneak glances at Deku as he enjoy his bowl of Katsudon. We ate in silence but got interrupted by Deku's phone ringing. He flashed me an unsure smile, I just nodded. He took it as a sign and answered the call.

"Mom! I miss you!!!!
Uh, yes.
Yes..
Err..yes, mom!
You too!
When will you be back?
Oh, okay.
Just take care, okay?
I'm good here, don't worry!
I love you!"

I love you.

Those three words got stuck in my mind I didn't notice Deku has been staring at me.

"Yen for your thoughts, Kacchan?" He giggled.

I smirked. "Shut up, nerd!"

We finished our meal and went straight to the supermarket. I was picking up supplies while drafting an estimated recipe of the steak I enjoyed at the Karaoke.

"Kacchan? Err, that's too much, you know."

"Shut the fuck up, shitnerd."

I paid for it despite the fact that Deku kept bugging me about mom's credit card. I have my own fucking money.

We went home at past 6PM. I started to cook, still in my outdoor clothes while Deku change.

"What are you doing, Kacchan?"

"Of course I am cooking! What else. Tch!"

"You can cook???!?!" What the fuck. I can fucking cook better than you, shitrag.

"WHAT?! You sound so surprised. I watched that old hag cook since I was a kid, fuckface!"

"Heeeh!?! But they said you can't.."

"Just shut up and set the table!"

He kept mumbling things I couldn't quite make out of so I just shrugged it off.

We ate and I saw the glimmer in the nerd's eyes as he took his first bite. I rolled my eyes at him.

"WOW, Kacchan!!"

"What the fuck, Deku! Just eat."

After dinner, Deku volunteered to clear the dishes. I let him and enjoyed a warm bath.

Putting on a black tank top paired with my red boxers, I cleaned my room and flipped through my notes.

Minutes ticked by and I heard Deku taking a shower. I stood by my door.

"Oi, Deku." I said as he was getting out of the bathroom in a blue All Might shirt and brown shorts.

"What is it, Kacchan?" He was a bit surprised but tried not to show it. He failed as blush crept to his freckled face.

"Checking me out, are you nerd?" I smirked mischievously.

"N-No. No, Kacchan!" He waved his hands frantically.

I laughed.

"Well, Kacchan..what do you want to say?"

"Nevermind." I stepped back inside my room and closed the door.

Izuku

What do I feel for Kacchan?

I mean, I'm happy. He is my dear friend. But, us kissing? That's way overboard. I sure don't have gender confusion but does he?
I like Kacchan. Still, I don't want to raise my hopes up. What we have is platonic.

Whatever, Izuku. Just go to sleep.

But I couldn't! Gaah.

Katsuki

I tossed and turned in bed.

Good thing it's Sunday tomorrow. Ugh! Deku, you shitnerd, messing with my head like this. Fuck this shitty mind!

Dammit!

I stood up and went to Deku.

"Deku."

The nerd bolted up.

"Sleep with me."

Damn. I think I failed your expectations.. I'm sorry, I'm just not good enough. I will keep on improving my writing tho. Thank you for all the support. You dont know how happy this makes me. I'm just dealing with so many shits in laifu and this is my way of releasing stress and tension. Arrrgh!