Derek didn't need any encouragement to keep going, but he did love hearing those sounds out of Stiles, and lapped appreciatively at this throat for them, a happy little rumble coming out of his chest. One that continued through the affectionate term, and the hands through his hair.
"Yours," he agreed, eyes closing blissfully as he caught the faint edges of Stiles' orgasm, that thicker, sweet spice that he loved and enjoyed. Nosing under his chin, he breathed in deep, let that scent soak through him and shuddered, hips edging forward so his mate could have everything he needed to get there again.
And Derek? He was too far gone to feel any vindication in knowing he was right, that this would be that fucking good, that Stiles would and could come again and again around his knot.
But then he wiggled, and this close, Derek could feel it everywhere, the shift of his hips, the movement in his abdominal muscles, and inside. God, inside. He groaned, eyes flashing open long enough to see that look on his mate's face, and shuddered as he came again too, knot throbbing as he ground in deep.
He never wanted to leave this spot. Ever. And laved at Stiles' clavicle until something else caught his attention. His mate deserved orgasms -- he backed up a little bit, enough that his spine could arch, knot still locked deep within his mate -- and lapped at his previously ignored nipples.