Inspired by Symbiotic Quirks by Ravennest (AO3)
https://archiveofourown.org/works/28852461

Many thanks to the lovely Ravennest over at AO3 for inspiring Izuku's quirk in this one. If you have the time, please check them out, because they've got a little bit of shindeku there themself ;). But also jusr a lovely author all around.

Summary: Izuku shivers under him, eyes fixed on Hitoshi, all but looking up at Hitoshi like he's looking up at some impossible mythical being instead of a plain old human. It's intoxicating, having this sort of attention from Izuku, like Hitoshi is something so beautiful that Izuku can't take his eyes off of him. Their classmates like to joke that you're not really a member of class 1-A until you've had your quirk analyzed by Midoriya, and Shinsou had never felt that more viscerally until he'd had a taste of Izuku's attention himself the first time. Until it had been him, under the gaze of Izuku's quirk, made powerful by Izuku's words as the boy couldn't stop gushing about his quirk.

-

Hitoshi hears the door to his room open somewhere outside the bathroom. He only pauses for a second, before turning back to the mirror and continuing to comb his hair after having just blown dried it. A second later he sees his boyfriend, one Izuku Midoriya, poke his head in to catch his eye in the mirror. He looks relieved, as if he hadn't expected to find Hitoshi here.

"Hitoshi."

"'Zuku." Hitoshi hums and continues, but not before he notices the look in Izuku's eye and files it away for later, "I could have been taking a shower."

Izuku rolls his eyes and steps inside. It takes another step forward for him to be standing right behind Hitoshi, from where he wraps two strong arms around Hitoshi's waist and presses his face against the back of Hitoshi's neck, "Don't be a smartass, the door was open. I'd be more concerned about you not locking the door while showering."

Hitoshi sighs and gives up on the brush in his hands when there's not much he can do now with a warm body pressed against him. And besides that, it's easy to feel the line of tension threaded in Izuku's frame, tension unnoticeable except to the keenest eyes. He points it out in the next moment, bracing a hand against Izuku's own around his waist. "You're tense."

Izuku hums non-committedly, and Hitoshi has an inkling to what the problem might be, has been dating Izuku long enough for this to become a fairly common occurrence, "Sometimes," Hitoshi teases as he turns around in Izuku's grip, until they're facing each other, "I wonder if you only ever started dating me for my quirk."

"'S not true." Izuku's already dipping forward to nestle his face in the curve of Hitoshi's neck, head tilted to mouth clumsily against Hitoshi's jaw, "I date you because I like you."

"And my quirk."

"And your quirk."

Hitoshi chuckles before he lets out a heavy breath at Izuku pressing a kiss on his neck, trailing down with a whole bunch of butterfly kisses right from the underside of his jaw to his collarbone. He leans heavily against the counter, hands braced against it to keep him standing. "I'm surprised you're still using your words."

"Haven't activated it yet."

This makes Hitoshi pause, "You haven't activated your quirk yet?"

"No." Izuku mumbles into his collarbone, arms slowly tightening around his waist, "I'll... slip. I wanted you to get comfortable first."

And oh, Hitoshi knows very well how Izuku can get when he's feeling that particular withdrawal aspect of his quirk, knows that Izuku feels that keen instinct of, 'want-need-crave-need-want something­' so strongly he can get a little... rabid, at times. It's endearing, how he's holding on just for Hitoshi, because he wants Hitoshi to feel comfortable too.

"Alright then." Hitoshi's voice is low and purposeful, "Let's move to the bed."

-

Izuku's quirk, like his, is a mental quirk.

It allows him to 'feel' someone's quirk once he touches them. As Izuku describes it, he can see physical manifestations of a quirk and can sense how strong a quirk is, even how strong a quirk has the potential to be.

Somewhere at the three-month mark into their friendship Izuku had admitted how some quirks, notably powerful quirks, are almost like drugs for him. He can get drunk off of feeling their presence if he's not careful and as such, has been learning how to control himself whenever he comes into contact with a new one.

It's only after a lot of practicing and meditating and what not that Izuku can now block his quirk out, from time to time. The drawback to this is, of course, is that sometimes he experiences withdrawal symptoms and goes into a state of mind where his first priority becomes hunting down a quirk powerful enough to satisfy that itch in his being. He's gotten better at curbing it, but he has to take care of it eventually, right?

It's a good thing Hitoshi's quirk is so powerful, then.

-

It takes them maybe five minutes to settle, until Hitoshi's settled onto Izuku's lap as Izuku leans against the bed's headboard. His pupils are blown wide and already, his breathing is stained, just barely holding onto the quickly crumbling walls of his sanity that keeps his quirk at bay.

Hitoshi presses a hand against his jaw, "It's okay, baby. You can let go now."

Izuku's eyes flutter shut as he lets out a loud breath and starts to relax, shivering as he goes. His breathing evens out, head tilted heavily into Hitoshi's palm. Hitoshi watches him with a half-lidded gaze as Izuku opens his eyes again, irises glowing a telltale toxic green.

"There you go." Hitoshi purrs, "Doesn't that feel better?"

Before he met Izuku, he'd never known there might have been a difference in his voice when he was and wasn't using his quirk. In fact, it's almost unnoticeable, except for someone like Izuku who's quirk renders all the difference in vivid detail. It could be the pitch, the cadence, the way he drawls his words sometimes, but only Izuku will ever really know the difference.

Izuku shivers under him, eyes fixed on Hitoshi, all but looking up at Hitoshi like he's looking up at some impossible mythical being instead of a plain old human. It's intoxicating, having this sort of attention from Izuku, like Hitoshi is something so beautiful that Izuku can't take his eyes off of him. Their classmates like to joke that you're not really a member of class 1-A until you've had your quirk analyzed by Midoriya, and Shinsou had never felt that more viscerally until he'd had a taste of Izuku's attention himself the first time. Until it had been him, under the gaze of Izuku's quirk, made powerful by Izuku's words as the boy couldn't stop gushing about his quirk.

When Izuku doesn't say a word, looking like he's all but forgotten that maybe Hitoshi asked him that question for a reason, Hitoshi cups Izuku's cheek gently and says, "I want your words sweetheart. I want to hear what you have to say."

Izuku eyes shut again as he lets out a sigh, a beautiful picture of submission, "Yes, I-I feel good."

There's no hesitation, not even a moment to consider because they've done this often enough for Hitoshi to know what Izuku wants, that Hitoshi takes control of Izuku's mind as easily as plucking the strings of a harp. As easy as anything, to put Izuku under, to be holding his mind in the palm of his hands, ready and willing to do anything Hitoshi asks of him.

And not even a moment later he lets go, relinquishes control just to watch Izuku gasp to the surface, breathing heavier and eyes wide with something so dangerously close to pleasure that it makes Hitoshi preen in satisfaction. Hitoshi is being pulled closer in the next moment, arms snaking around his waist to pull him down. But instead of letting it happen, Hitoshi stops his decent with a hand on the headboard, hovering mere centimeters over Izuku's face.

Izuku still looks dazed but also confused, and the sight is damn well endearing, if nothing else. Still, there's a warning laced in his tone of when he says. "Izuku. Behave."

Izuku blinks, "Sorry. I- I need more."

Hitoshi sighs and scoots back just a little, pulling Izuku up along with him. He curls his arms around Izuku's neck, making sure to press his skin purposefully against Izuku's. Izuku shudders at the contact, eyes glassy and somewhere distant as he gazes absently at the space above Hitoshi's head. Hitoshi sometimes wonders what he sees, what could be so intoxicating as to make his mind go fuzzy like this.

"You can touch me, if you want. Anywhere above the belt is fine."

Izuku eyes focus on him for a second, before he's tipping forward to rest his face in the crook of Hitoshi's neck. None-the-less, Hitoshi feels hands slipping under his shirt, content to press against the bare skin of his back. Izuku clings to him with a sigh, breathing slowly coming to settle again.

It's invigorating, a rush like no other, to be needed like this. To be craved and treasured in equal amount, heady in its intensity. Even though these moments are more for Izuku's sake than his, Hitoshi can't help but wait for the next one.

-

And that's all for this one folks! Know it's a little short but eh, what can you do. Until next time then.

Your Captain, Lynda.