Stiles moaned, muffled by Derek's body but still loud enough for his mate to hear. He liked Derek using him- again, those were words he would never have wanted to associate with anyone, but it was different with his mate. With Derek. He liked being pressed against, being fucked against, liked that he was giving pleasure, or was just the instrument for it. It didn't matter. He'd happily let Derek take anything he wanted from him, would let Derek ride him or sit on his face or hold him down and fuck him- He'd love all of it.
"Good boy," Stiles whispered, pulling his tongue back, kissing Derek's thigh. "Good boy. Look at all the orgasms you're having, you're a good boy for me." He took a moment to gaze up at his mate, watching him with dark eyes before he lowered his head again, resuming his clean up, letting Derek rock down on him again and again and again. All of the words Derek had said to him, they were easy to repeat. Easy for Stiles to say back. They didn't really stick to their gender roles, and Derek wouldn't have it any other way, he knew. He treated Stiles as an equal, and that would stay the same-
Stiles wasn't going to touch Derek's cock, just this, just his tongue. It would probably only be a little orgasm, but it would be enough to end the night on. Stiles would be more than satisfied. He ran his tongue around Derek's rim before pushing in again, seeking every sensitive little place. He debated pushing a finger in, but it would be more fun to have Derek come from just one point of stimulation.
"I'd get on my knees for you any time you asked," Stiles whispered in between laps at Derek's entrance. "Present myself to you, or go down on you, whatever you wanted. I want you to use me, I want you to play with me. And I'll do the same to you. Always. Tease orgasms from you, make you keep coming. You're going to come for me now, aren't you?" he teased, lapping between each sentence before finally pushing his tongue back into Derek, humming loudly and happily, especially now that Derek was tighter again. He curled his tongue, pointed it, humming all the while, knowing the vibrations would help a lot, too.