Check Your Phone [Threadvember]

A threadvember fic for Paigetaylor on ko-fi! This one will become a public post on Patreon rather than a twitter thread since I try to keep my Twitter fairly SFW

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"I wish you would check your texts," Izuku pouted, hurrying to catch up with Katsuki's brisk pace. "I sent you four of them and you didn't even look!"

"Was busy," Katsuki shrugged, slowing down a little for Izuku's shorter legs. "You miss me or some shit?"

"I was asking you out to dinner!"

"Oh," Katsuki grimaced, stopping to look at the pathetic eyes staring up at him. "Um, sorry. I just forget about it sometimes, it's not you."

"I know," Izuku sighed, linking their hands together all the same. "Can you just try to check it occasionally? Set an alarm or something? Turn your alerts up extra loud when you're not in class?"

"I'll try."

"Thank you," he paused, reaching up to kiss Katsuki's cheek. "You're such a good boyfriend, Kacchan. I love you."

"Whatever, nerd," he grumbled, blushing bright red as he turned to return the gesture. "I love you too."

As they made their way back to the dorms, their studies and extra trainings done for the night, Izuku found himself hatching a plan. Maybe, just maybe, if he made the messages enticing enough he could condition Katsuki, in a sense. Make him want to check his phone, instead of forgetting about it entirely.

When he'd eaten dinner with Katsuki in the dorm kitchen and found himself safely shut away in his room for the night, he began to put his plan into action. It took him a while to come up with the first one, staring at his phone screen and gnawing on his lower lip. It wasn't like he was the most self-confident guy in the world, especially since he'd earned all his scars and bruises, but Katsuki seemed to like his body all the same, so maybe...?

He tugged at the hem of his boxer shorts, dragging them down to sit low on his hips, and with his shirt bunched up around his chest he snapped a quick photo.

You were right Kacchan, I should have eaten more! My abs are showing!

He knew it would probably take hours for Katsuki to check it, if he remembered at all. He was generally pretty good about sending a "goodnight" text when he turned in for the night, but it would be just Izuku's luck if it turned out to be the one day he fell into bed exhausted and forgot about his message. He sat back to wait with his homework in his lap, and soon his phone was buzzing on the bed beside him. He'd remembered after all!

What are you doing, nerd?

Just homework!

He sent it back with a picture of the textbook in his lap, his shorts riding up around his thighs, squeezing his muscles tight to make them pop a little better.

Are you trying to torture me?

Just showing you what you're missing out on!

I'll be there in 74 seconds

You've timed how long it takes to get to my room?

He didn't get a response this time, but soon he heard footsteps hurrying along the corridor, a heavy fist pounding on his door.

"Evening Kacchan," he smiled sweetly. "Would you like to come in?"

As soon as the door was closed, Izuku found himself shoved against it, struggling to repress his grin as Katsuki dragged his lips into a demanding kiss.

"You know," Izuku grinned, when their lips parted for a moment. "You won't always be able to just run to me every time I send you a fun text."

"Watch me, nerd."

"Sometimes you might have to, I dunno, text me back?"

Katsuki snorted, tangling his fingers in green locks to pull his head back, their eyes meeting.

"You're plotting shit, aren't you?"

"Not at all, Kacchan!"

"You're such a shitty liar."

"Do you really want to argue about this right now, or would you rather come check out how comfy my bed is?"

"You're such a dork."

"I love you too."

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Wish you were here, Kacchan. Would love to see you gasping on my sheets, hands clutching at my pillows while I suck you off. Bet you'd look gorgeous all needy and desperate.

Katsuki wasn't sure what the hell the nerd was thinking, but he couldn't bring himself to complain. There was something super fucking hot about the little messages that arrived out of the blue, the occasional photo of his gorgeous, muscular body. But the more pressing problem was: What the fuck was he meant to do now?

Izuku had gone home for the weekend to visit his mother, so Katsuki couldn't just run to his dorm room. Worse, Katsuki had decided to hang out in the dorms rather than visit his own family, so they were at least a forty minute train ride away.

He knew what Izuku wanted, but he didn't have a clue how to deliver.

"You okay dude?" Denki asked, leaning an elbow on his shoulder. "You've been staring at your phone a while."

Katsuki blushed, darkening the screen quickly, realising far too late that it only made his asshole friends all the more curious.

"Oh, we hiding something now?" Denki teased, swiping at the device playfully. "Lemme see, Kacchan."

"Fuck off, none of your business."

"You're clearly having a hard time with something," he smirked, glancing pointedly down at Katsuki's very prominent bulge. "Is the sweet little freckle-boy sending naughty texts?"

"Shut the fuck up."

"He is!" Mina gasped, diving at him to snatch the phone. "Oh my God Blasty you naughty boy!"

The moment Mina caught his attention, Denki was grabbing the phone from his hand, darting away too quickly for Katsuki to stop him. He lunged forward with explosions popping in his hands, but it was too late, Denki was already reading the text, his squeaky little Izuku impression ready and waiting on his lips.

"Oh Kacchan!" he fawned, holding his hand to his forehead as if he might swoon. "I wish you were here to ravage my- Oh my God, Midoriya is fuckin' dirty!"

"Shut the hell up!"

"No, seriously! Listen to this, guys!"

Katsuki flooded bright red when Denki read it aloud, still popping off explosions as he reached for the ass, held back by Eijirou keeping them carefully apart.

"Holy shit, Boom Boy is a Bottom," Mina laughed, throwing an arm around his shoulders and dragging him into a little hug. "I should have known you liked being ordered around!"

"There's no fucking shame in liking a dick in your ass."

He managed to snatch the phone back while his friends were laughing, burning bright red as he protected the device more carefully.

"What are you gonna say?" Mina teased. "Do you need some help?"

"Fuck off."

"How about oh baby please stick it in me?"

"Fuck you."

"Nah," Denki laughed, "more like uwu Daddy please let me taste the cummies, right?"

Katsuki reached out to punch him, thwarted by a little flinch away at exactly the right time. Thankfully he managed to keep his phone, though, despite the way Hanta tried to sneak in to grab it while he was distracted by Denki.

You would look hot choking on my cock

He made sure to sit on his phone while he waited for a reply, keeping it safely out of reach from all but the boldest of his asshole squad, but he caught their snorts when he adjusted his pants a little.

"You need some alone time, bud?" Eijirou grinned. "You never spend time with us anymore, it's always 'Deku this' and 'Deku that'. I'm starting to get jealous."

"It's fine," he insisted through gritted teeth. "He's just trying to make me pay attention to my texts, he's messing around."

"Are you sure, dude? Looked pretty legit to me."

"Of course I'm sure. Don't fuckin' question me, I know my boyfriend."

"Awww," Mina cooed. "It's still so cute hearing you say that word."

"Whatever, assholes."

I'm gonna make you beg for it. Tease you until you can't take it anymore and a little more for good measure. You'll be so desperate to cum that you'll do anything I say.

Maybe Katsuki was going to have to excuse himself after all.

"I'm going to bed," he growled, climbing up off the floor with his phone still clutched tight. "Don't wake me up, ass-hats."

"Have fuuuuun," Denki teased, waggling his fingers in a wave. "Say hi to Midoriya for us!"

"Fuck off."

He walked quickly back to his bedroom, trying not to look over-eager, contemplating his next message as he went.

Make me, nerd.

Oh, don't worry Kacchan, I will.

He hated himself for the way it made him shiver, quickly locking the door and flopping onto his mattress. He snapped a quick photo of the bulge in his pants, sending it Izuku's way, then set to work shedding his trousers and underwear.

You better not be touching, Kacchan. Not without asking first.

He whined quietly, hating himself for the sound and contemplating how best to punch himself in the face for it. His hand trembled slightly around his phone, staring at the demanding words.

Can I touch?

Are you going to say please?

Katsuki groaned to himself, but his dick was aching, throbbing with blood, and he only had two real choices: number one, do it anyway and hope Izuku couldn't tell, or two, say please.

Please?

You can do better than that, Kacchan.

Can I please touch my cock?

Yes you can, but be a good boy! No cumming until I say so.

Katsuki groaned with relief when his hand wrapped around his shaft, already a relief even though he'd barely moved. He could probably cum in less strokes than there were fingers on his hand, if he did it right, but he had to take it slow lest he risk Izuku's wrath.

If "wrath" meant "days of sulking and not playing with him because he came without permission".

He stroked long and slow, biting at his lower lip to keep from making a sound, and with his free hand he picked up his phone again.

It feels good.

Tell me more, Kacchan!

Like what, shitty nerd?

He groaned, throwing his head back as he slowed his pace even more, trying to hold on a little longer.

What are you thinking about, Kacchan? Are you imagining it's me?

No

You're not? :(

Your hand feels a thousand fuckin' times better than mine, I couldn't if I tried.

Awww, Kacchan! ^^

Will you quit with the dumb faces and help me get off here?

He expected to get another lecture in return, another warning to slow down and wait for permission, but instead he got a new image: Izuku, laid out on old All Might patterned sheets, his pants hiked down to his thighs as he stroked his swollen cock.

Cum for me, Kacchan

Katsuki saw white, shooting his load all over his body and his blankets, and for a moment he felt oddly ashamed of himself for making it so easy for Izuku. He snapped a photo all the same, sending it back as he reached for a towel.

Is Kacchan gonna say thank you?

He growled quietly, but began typing again anyway, cheeks still burning pink.

Thank you for letting me cum. Next time I wanna do it on your face.

Good luck, baby, you know it'll be the other way around.

In a moment of boldness, Katsuki raised his phone a little higher, sticking out his tongue and opening his mouth wide before he took another picture.

Yours goes in here.

Fuck, Kacchan, I'm gonna fuck you up so bad if you make that face at me.

I'll be here.

There was a pause for a moment, Katsuki's eyes falling closed as he caught his breath, but he couldn't help but crack a smile when the next message came through.

I'm on my way.

Looking forward to it

He dragged himself off the bed to clean up a little, grabbing some old towels to wipe himself off and shedding the messy blanket, leaving the rest of the stack on the bed for when Izuku arrived. They would make plenty more mess, but they could at least do it on something less annoying to wash than his entire duvet. Or sleep in Izuku's room after, but the thousand All Might eyes kinda creeped Katsuki out.

Have you learned to check your phone now?

Katsuki smiled to himself, unlocking the door and lying back on his clean bed to wait.

If I say yes are you gonna stop sexting me?

I'll be more inclined to sext if I think you'll read it and respond instead of blue-balling me for hours.

I think I've learned, but I might need a good spanking just to be sure.

Little slut.

With a smirk, Katsuki held his phone up, taking a much more innocent selfie with what he hoped was a cute little wave.

See you soon, Daddy.

Fuck. You better be ready.