Those cries left his gums tingling, and he knew Stiles wouldn't mind. That he'd like it, and so he didn't fight it, letting his teeth shift and pressing them up against his jaw where he could feel them. They were all for Stiles, all because of his lovely, sweet mate.
He whined as he felt that budding tension in Stiles' thighs, his muscles trying to clamp down on his knot, and growled when he came again, just as Derek wanted, his own orgasm chasing Stiles'. He'd never get tired of that, never get tired of feeling his mate coming around him and provoking more pleasure out of him.
It was the nails digging into his skin that had him rocking in hard. They were a sharp pleasure in his arm, a grab that most people wouldn't make and that he loved almost as much as the hand in his hair.
And in the background, he heard his beta's pleasure, but it didn't stop him from pressing his face into the side of Stiles' neck and breathing in deep. This was the pleasure he wanted, the scent he craved, and he let out a pleased growl at the affectionate term.
"Do it," he ground out around teeth too large. Even if they were both actively trying to avoid Stiles' pregnancy, it didn't stop either one of them from wanting it. Didn't stop him from rutting in and doing his best to help Stiles' orgasm. "Want you to--" He set his teeth against the bite mark he'd made with human ones, and lapped at the spot, words too difficult to try for more of them as his knot throbbed inside his mate.