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It starts out innocently enough. One day Gojo storms into the basement tired and pissed from having to deal with the higher ups. He picks Yuuji up off the couch, drops him in his lap, and then just... aggressively cuddles him.
“Keep watching,” he snaps, and Yuuji does, continuing with his training as he channels cursed energy into the doll.
It takes nearly two full movies for Gojo to relax enough where he stops squeezing so tight. If Yuuji weren’t so sturdy, he definitely would’ve bruised.
They don’t talk about it afterwards.
But it happens again. And again. And as it keeps happening, Yuuji picks up little tricks to help Gojo relax faster.
He likes it when Yuuji just sorta melts into him, going boneless in his hold, head leaned back on his shoulder. He likes Yuuji spread wide, his legs hooked on the either side of Gojo’s, really testing the limits on the flexibility of his hips. He likes sticking his hands up Yuuji’s shirt, “because it’s warm,” petting his abs and cupping his pecs, his fingers gently teasing Yuuji’s nipples.
He really likes playing with Yuuji’s nipples. He’ll pinch them, flick them, pull them, until Yuuji’s sore and sensitive and squirming so much on Gojo’s lap that he’s not at all surprised when he feels the man’s erection digging into his ass.
At first he just grinds them together through their clothes. He grips Yuuji by the hips to hold him steady as he rocks up, chasing his own pleasure, telling Yuuji to pay attention to the movie, to his training, whenever he gets too distracted.
The mess in his pants must not be worth it though, because soon after that that Gojo swings by with a stupidly big bottle of lube. He fingers Yuuji open during the opening credits of Human Earthworm 3 and has him bouncing on his cock before the main character is even introduced.
If Yuuji weren’t at risk of being socked in the face by that damn doll, he could maybe come too, but Gojo keeps reminding him to focus on his training. So he does, and he lets Gojo come inside him with a muffled groan, and he warms his cock just like that until the movie’s over.
Apparently the big bottle of lube is for him. Yuuji gets told to use it, to get himself ready, because Gojo wants to be able to slide right into him the moment he gets back.
He’s not kidding either. The first time Yuuji does it himself, he doesn’t prep enough. It hurts. Not enough to want to stop, but enough where Gojo’s relentless selfishness becomes so fucking hot. He takes a gamble on the doll, and the aching bruise that later blooms on his jaw is absolutely worth finally getting a hand on himself and coming on Gojo’s cock.
After that, Gojo takes him anywhere he wants, any time he wants.
At first, it’s limited to that secret basement—on the couch, in the kitchenette, woken up in bed in the dead of night when Gojo returns from an especially long mission.
Yuuji doesn’t mind. He thinks he might even like it, actually, being wanted so badly that such a coolheaded guy like Gojo Satoru loses every last bit of his patience just to have him.
But then he gets reintroduced to society, and it’s like Gojo becomes insatiable. He yanks down Yuuji’s pants and fucks him wherever he wants. He uses Yuuji in public bathrooms, in the classroom, in Ijichi’s car, uncaring of who hears or sees.
(The first time they get caught, Yuuji comes all over himself with an embarrassed yelp, the humiliation ratcheting up his sensitivity so much that Gojo fucks a record four more orgasms out of him right there before finally spilling his own load deep inside him.)
In fact, they get caught so often that eventually Gojo just stops giving any fucks at all and starts taking him regardless of who’s already there.
... Yuuji might be in love.