Title: Stamina
Fandom: X-Men: First Class
Pairing: Darwin/Alex
Rating: NC-17
Length: 498 words
Summary: Darwin's powers means he adapts to all sorts of things, as Alex finds out to his frustration.


“You can’t keep up with me,” Darwin says, and he’s got that usual laidback smile on his face, not really teasing, just telling it like it is. Alex still feels himself bristle though, because he’s not good at backing down from a challenge, even if Darwin didn’t mean it that way.

Getting ready to push up on his elbows, steeling himself and setting his jaw to show just how wrong Darwin is, but he can’t. Flopping back against the bed instantly, because his body is too damn weak, shake in his arms and a groan in his chest. He’s so sensitive, every nerve lit up, and Darwin’s hand moves slowly as it strokes up his inner thigh, barest hint of pressure still enough to make Alex shiver.

“Told you,” Darwin grins, like Alex is being just the cutest thing, and Alex growls and tries to work his hips, tries to press up into Darwin’s touch. “Not your fault, man, it’s just how my mutation works. You’ll mess yourself up trying to match me.”

“Fuck you,” Alex grunts, feet bracing and knees fanning out. He can taste his own sweat in the air, and there’s jizz fucking everywhere, smeared across his stomach and chest and, God, his throat, because Darwin made him come that damn hard. Cock half-soft now, curved against his hip, two orgasms down and nowhere near ready for more, but Alex wants it anyway, wants it so bad.

“Don’t think you’ve got that in you right now,” Darwin chuckles, and his hand slides higher, fingers pressing against Alex’s rim, puffy and swollen and used. There’s come there too, and Alex whines and turns to bite at the thin skin of his wrist when he feels it slide down his cleft. “But wait a bit, and when you’re ready, I’m more than happy to give you another go.”

Alex feels his tired muscles trying to clench down on Darwin’s fingers, watching Darwin’s eyes go hooded for the sight. “Fuck that, I want it now,” he grumbles, and Darwin laughs, free and easy. Presses a kiss to Alex’s knee, fingers pushing in deep, and Alex moans, exhausted and fucked-out but not ready to give up.

Not when Darwin looks like that, still hard despite filling Alex up three damn times, despite fucking Alex until his throat feels croaky and sore with holding back his noises. Only the slightest hint of sweat shining around his throat, looking like he could go all night, and Alex bares down on Darwin’s fingers, feeling empty without Darwin’s cock inside him.

“More,” he moans, and he doesn’t care how plaintive and pitiful he sounds, because Darwin sighs like Alex is ridiculous, but also impossible not to indulge. Shifting closer, lining up, head of his cock dragging over Alex’s hole, and Alex would smirk or gloat if he had the energy, but instead he just whines and gives in to the sensation of Darwin fucking in and in like there’s nowhere he’d rather be.