"No, you're not." Derek grunted, pushing himself further, to trust in Stiles, and himself. "Because whores don't get to come," he panted. "Because slutty whores who like to beat off without permission don't get to come."
He thrust faster, harder, hands gripping hard enough to leave bruises, racing Stiles' orgasm, chasing his own. "You only come when I let you."
It was ugly, and forced, but Derek went still, muscles clenching and releasing as he climaxed, coming while still buried deep in the teenager's ass.