The only thing that pleased Derek more than the way that Stiles smelled was the knowledge that it was all for him. The claim he left -- the bite -- meant that he'd only ever smell that good to Derek. No one else. Not the alpha assholes at the station, not the ones at school, no one. He might smell nice to them, but never the way he smelled to Derek.
And that bite - it made him growl happily as he nosed against it. He'd have his own in a few weeks, but it seemed like it wasn't quite soon enough. He wanted it now, wanted to show off Stiles' mark and his status as a mated alpha.
"Always, always," he promised. Whatever Stiles wanted, whenever he wanted it.
He groaned as those muscles fluttered around him, mouth edging into a wide smile, loving that little show of Stiles' pleasure.
Following his mate's orders, he groped and plucked and toyed with his nipples until they were poking hard into his fingertips. "Can't wait to taste these when they're leaking milk--" he growled out, words lost in a moan as Stiles started fucking himself onto his knot, muscles going tense as he chased his pleasure.
"Yes," and it was barely a word, more of a growl as his free arm wrapped around Stiles' middle, holding him close as the edge of his nails raked up the hard points of his nipples. "Love seeing you like this, so needy, so eager for my come--"
Those cries were going to be the end of him, his growl rumbling around in his chest as he jerked forward, hips shoved against the plump swell of his ass to make sure Stiles got everything he needed. "Do it baby, do it, wanna feel you--" He panted out, and then he got his wish, those muscles trying to clamp down around his knot, trying to keep everything inside while Derek howled, knot throbbing as more come pulsed out of him.