Tussling with the Flash is nothing new, wrestling against the polished floor of the Flash museum isn't either. James doesn't even remember how they got there in the first place, and it seems unimportant now, way less of a pressing matter compared to the way Flash is not letting him get up from said floor and is instead keeping him pinned there, growling and giving off the unmistakable scent of rut.
James didn't even think Flash could have a rut. He's known him for a while, scuffled with him quite a few times, and he's never smelled anything like that on him. Any type of pheromones at all. He and the other Rogues speculated Flash was a Beta. That was definitely a wrong assumption seeing how there's the hot pressure of the man's sex rubbing against the back of his thighs, the bulging base clearly implying the presence of a knot.
James moves again but instead of twisting away he tries to rub back, chewing on his lower lip and holding himself up on a forearm as much as he can. Flash grunts behind him and shifts in a way which is less constrictive, bracing against him rather than forcing him down, his nose poking into the hair on James' nape.
"Damn..." There seems to be an attempt from Flash's part to get back to his senses. He nuzzles against James' neck but the mating gland doesn't even bulge, he's not an Omega after all. He is hard though, enough he has to swallow tight in the effort of not touching himself or attempt to rub against something.
"It's ok" he croaks, feeling behind to get a hold of the other man's hip, and almost immediately Flash resumes rocking against him.
He's pictured something like this happening quite a few times, with some variations, but in James' fantasies his old foe mocks him and gloats about his victory, verbally humiliating the Trickster while holding him down.
Now Flash makes soft rumbles to the side of his head and mumbles low praise, one of his hands finding James' erection in its pawing. "That's good, you're being so good-" he mumbles while rutting between his thighs and James keens under his breath, arching more against the other man's bulk.
Flash will surely kill him for this once he gets back to his senses.
Or not, after all James didn't start this, he just noticed the speedster acting a bit weird and being a bit more violent than usual, less chatty also, but he could never expect this. He's the one who's being pinned to the floor anyway, not Flash. He's also muffling quiet groans into his own arm, face burning hot and hips rolling, and at the moment he doesn't care much about anything else.