There was very little that Derek would openly resist when it came to Stiles? This? This never even had that possibility as he moaned, spine arching as Stiles worked the plug into his slick hole. His thighs trembled as it began to thicken, and he couldn't stop from humping his hips forward, a little more come dribbling out of him.
Without Stiles' hand around it, his knot was sure to go down soon, or so he thought until he felt his tongue moving over his skin, and Derek knew what Stiles was doing - what he was cleaning up, and moaned raggedly.
He'd mentioned wanting to do this last night, but never gotten around to it. Tonight, apparently, it proved to be too much, and Derek was infinitely grateful for it as he moaned brokenly, and rocked back to meet his tongue. "Fuck, fuck, fuck, Stiles, feels so good, love your tongue-"
Derek wanted more of it too, but knew if he asked, if he tried for more, they'd never make it out of bed in time to go to dinner and he wanted to do that for Stiles, and give him everything he wanted on this night.
"Yeah," he practically moaned out, muscles flexing a little as he tensed and relaxed around it in time with Stiles' kisses. He should move, get up, but he barely managed to roll off his mate and instead ended up pillowing his head on Stiles thigh, one arm flung over his middle.
"Mmm, Stiles," he said with a little nuzzle, still feeling half dopey from his knot. That wasn't usual, but he had a feeling it had something to do with how much he trusted Stiles. "Feel like I go half stupid every time I pop a knot around you. Give me a couple and we'll go get in the shower, okay?" They needed to at least try to wash up before left the house reeking of sex.
As much as he liked it, he didn't think everyone else would.