2 Works by strzyga in Star Trek: Alternate Original Series (Movies)
Jim wakes as the birds fall silent. Beside him, Spock is still asleep, eyes twitching beneath the lids. His eyelashes are thick and dark against his cheekbones, and there is the faintest green flush to his skin, delicate like the flesh of a melon. Jim's breath hitches. Heat washes over his skin. He'd always noticed, academically, that Spock was attractive. This is different. He knows what Spock's dick feels like, knows how the blanket of dark fur on his chest feels when it scrapes against Jim's back.
Things will never be the same. He has already been irrevocably transformed.
(spock is stripped of his logic on an away mission gone bad and turns feral, incredibly violent and utterly brutal. when he comes across jim, though, he is possessive, protective, and even affectionate. summary edited 6/19/19.)
Kirk loves running his mouth during sex. He talks dirty to turn Spock on, but half-way through it, he completely loses it and is reduced to babbling/begging/embarrassing professions of undying love. written for the kink meme.