KINKTOBER DAY 18: Mind break (comm from @/ForFanfiction)
cw: dkbk, dub/noncon
Katsuki & Izuku have been fucking since 2nd year. It began with puberty gifting Izuku and is currently at a point where Izuku fucks Kacchan into the mattress daily. He's happy to hear Kacchan say, +

"Eh, the sex is decent. Nothing /impressive/, though."
Izuku scowls, and remembers when Kacchan had barged into his room, demanding sex because he was 'so damn hot, Deku, fuck, I need it so badly'. He hadn't been calling the sex /decent/ then, had he? But that night, when Izuku +

nonchalantly brings it up after a particularly heated session (Kacchan is still flopped on the bed, boneless), the blond scoffs and says, "What, you think this shit is impressive? It's ordinary sex, if you were shit we wouldn't be fucking at all."
"But all those things you say-"+

"Oh, for fuck's sake, Deku," Kacchan sighs, rolling his eyes, "I say whatever random shit gets me off, I don't /mean/ any of it. Trust you to be butthurt over it."
And maybe Izuku would have been able to brush off the rest of it. But that last statement? He's going to make the +

blond bite his words.
Silently, he reaches into his drawer, pulling out the restraints. Kacchan is still on the bed, staring at the ceiling as he says, "Oi, Deku, why are you being so qui-whatthefuck!?"
Izuku grabs his wrists, firmly clicking the handcuffs and attaching them to +

the headboard. Kacchan's hands spark as his legs kick wildly, but Izuku catches them with his hands and ties them down. "Deku, release me /now/ or so help me I'll blow your entire fucking room up."
Izuku doesn't use gags because of Kacchan's triggers and because he loves the way+

Kacchan sounds in the throes of pleasure, but he can't deny that he's /tempted/ right about now.
"No," Izuku commands. "You're not. If you do, I'm not touching you for a month, okay, Kacchan? And don't be too loud, there are people living around us."
"The hell do you mean by +

don't be- oh, fuck no. Fuck, Deku, stop it. Deku, I'm ser-hnnn /fuck/!"
Izuku loves the way Kacchan's eyes widen as he pushes the dildo into his sloppy, used hole, cum spilling out around it as Izuku pushes the whole thing in. Kacchan's back arches, legs trembling a little as +

Izuku fits the whole thing in. He knows why Kacchan's eyes are so wide. Because he recognises this dildo. But he reminds him anyway, picking up his phone as he says:
"I'm sure you remember the dildo, Kacchan. It vibrates, controlled from an app, but it also /expands/, also +

controlled through the app. Now, I'm going to go study with Ochako. I'll be back in two hours, and you'll be on call the whole time, in case something goes wrong."
"Don't you fucking dare leave me like this!" Kacchan hisses. Izuku presses the highest setting and Kacchan's eyes +

roll back in his head from the overstimulation. He wants to stay and watch, but he has to show that he's not invested, even though he is. "D-Deku, I-I-"
"Oh, I almost forgot!" Izuku cries, slapping his forehead. He fishes out the cock ring, sliding it over Kacchan's throbbing +

cock. Kacchan whimpers loudly.
"Is there something you want to tell me?" Izuku asks innocently. Kacchan's face contorts, trying to mask the pleasure.
"F-Fuck off," he manages. Izuku admires him for being able to talk, considering they'd had sex three times already that day and +

the overstimulation must be strong, but Kacchan can't talk to him like that. He's going to make Kacchan admit just how much he likes Deku's performance in bed.
"Okay," Izuku shrugs, picking his stuff up and leaving as he ignores Kacchan's desperate whine.
***
Katsuki doesn't +

know whether he's in heaven or hell. The dildo gets thicker again, stuffing his hole to the limit as the vibrations get more intense. Fuck Deku. Fuck Deku and his sexy body and his confidence and his command and his /sex god/ aura. Katsuki's addicted to him, mind and body, but +

he'd never admit that to Deku. Well, not unless Deku chooses to force it out of him. His dick aches, although aches is a fucking understatement. He can barely fucking think, all he wants to do is /cum/. It fucking /hurts/, his prostate being abused as the dildo inflates even +

/more/. Fuck Deku, he's not getting what he wants.
But the thought of this going on and on and on....
Fuuuck.
He arches his back again, trying to push it deeper into his ass. He needs /more/, he needs to /cum/, he can't fucking /take/ it. As if Izuku can hear him, the vibration+

cuts off abruptly. He can't help the long, low whine that escapes his mouth. No, no, no, not like this, he wants it back, he'll be good, just-
Wait, what the fuck!?
No, he will /not/ be good! Katsuki bites his tongue, forcing himself back into the present. He's not Deku's little+

bitch, and he never will-
Oh, fuck, oh, /fuck/, the vibrations are back, more intense than before, and the dildo's filling his hole so fucking much and-
Where the hell is Deku?
He wants him, he needs him, h-he-
He has to get a grip on himself!
***
Izuku can't concentrate. There+

are ten minutes left on the clock, but ten minutes of not seeing Kacchan's wrecked face, the way his beautiful body writhes... It's torture, and when there are five minutes left, Izuku breaks, excusing himself early. Uraraka doesn't suspect anything, slumping forward as she says+

to him, "Ahh, you're right, we've been studying for way too long!"
Izuku holds his breath as he reenters the room, and what he sees is better than anything he could've ever imagined. Kacchan is sobbing, entire body shaking as his eyes roll back, mouth open in a pant. He grinds +

desperately against the dildo, and when Izuku stops the vibration, deflating the dildo remotely, Kacchan whimpers loudly, voice /begging/ as he says:
"N-No, n-need it, need it, hnnn, /please/, I'll be a good boy!"
"Kacchan?" Izuku asks softly, sitting down next to him. As soon +

as he comprehends Izuku's presence (it takes him a second, he's quite fucked out), he almost pushes off the bed in his eagerness, tears rolling helplessly down his cheeks as he moans, "D-Daddy p-please, pleaaaase!"
A jolt of arousal runs through Izuku's body at the nickname, +

because Kacchan only calls him /that/ when he's desperate.
"Yeah?" Izuku hums as he removes the dildo, pushing a few fingers in to placate the broken mess underneath him.
"N-Need y-your d-dick, f-fuuuck!" Kacchan sobs. Izuku positions himself over the blond, his broad chest +

covering Kacchan's tight torso as he pulls his dick out, stroking it to full hardness.
"Mm, you want mind-blowing sex?" Izuku purrs, rubbing his dick over Kacchan's oversensitive hole. Kacchan nods, sniffling. Izuku sort of wants to take a picture, but Kacchan will kill him when+

he's back to his usual self.
"Oh, then I'm sorry, Kacchan, I can only give you /ordinary/ sex," Izuku taunts, and something flickers in Kacchan's eyes, like he's trying to fight it. But then Izuku presses the tip of his dick against his hole and he wails:
"N-No, it's the /best/!"

(Tweet limit wants me to tell you that's it's twenty to three and I have a shit ton of uni work to do so I'll be finishing this tomorrow along with tomorrow's thread! Don't worry, I'll slowly catch up with kinktober I hope it's good so far... Please consider supporting )