captain-snark:

Derek destroyed casually one afternoon, when he happens to overhear a conversation while in the checkout line at Target or something. Because there are a couple of guys somewhere around electronics talking about Stiles. 

Derek probably has some kind of Pavlovian response to the name. He tunes in about: “He’s so fucking obnoxious.” Which Derek agrees with. “And mouthy.”

“Yeah, but, man can he put it to good use at least.” Which Derek does not agree with. On almost every level. On a level that definitely wants to punch this person on principle. 

But also, on the other level where then of course he cannot stop thinking about it. He wants to believe that it is that Stiles is a very good kisser which is still terrible for Derek, but he doesn’t really believe it. 

Finally, Stiles starts noticing Derek’s recent penchant for staring at his lips. A lot. When confronted about it, Derek asks if he knows someone named ‘Jack’ and Stiles gives him a befuddled sort of look before one of dawning comprehension falls over his face. 

The way Stiles blushes confirms for Derek all his worst nightmares. Except, then there would be flirting, tension, and finally, Derek naked on his couch, Stiles kneeling on the floor between his legs, deepthroating him.

Derek destroyed casually one afternoon when Stiles sucks him off, fast and hard.