Stiles' breath caught in his throat when he felt the head of Derek's cock catch and drag over his opened hole. It would be so easily for the werewolf to press and push inside of Stiles and in that moment Stiles would only encourage Derek. He didn't care that they were in an alley.
"Oh god yes. Yes. Yes. And I'll be sucking your cock down my throat," Stiles panted out as he listened to Derek beat himself off. "Gagging on it. Chocking on it. Fuck! I want your cock, Master!"