If it wasn't his mouth, it was those fingers driving him insane as Stiles' nails scratched at his thighs. Not out of alarm, but enough to have the muscles in his legs tensing again as he bucked up. He was so going to wake Stiles up like this tomorrow morning, let him know how good of a wake up call it was.
"I know, I know," he panted out, that whine momentarily stealing his breath. "But one good turn deserves another, and I want to taste your cock, baby." Maybe see how the rest of him tasted this morning too, see how much leaked out of him during the night. "Fuck, might have to have your ass first though-"
Said ass moved higher in the air and while Derek knew what his mate was doing, it seemed so much like it was on offer that he moaned, cock twitching against his tongue. "Fuck me, you have no idea-- look so good right now, baby." And for once he wasn't worried about lasting, just let that pleasure roll up from his toes into his core, his grip a little bit tighter on the back of Stiles' head as he fucked up into his mouth.
"Gonna make me come--" he started to say and growled, loudly as that groan vibrates around his length. So his baby enjoyed this every bit as much as he did. Good. "Gonna, Stiles, gonna come so hard for you. Are you ready baby? Want it?"