Stiles looked confused for a moment, wondering what he had done to make Derek react like that. Once he was sure that, no, none of his creamy white skin had been exposed by accident he realized what it was. Well, hell, if that's what turned Derek on, Stiles could work with that.

Maybe someone on tumblr will write a lengthy meta post on why Derek liked to be dominated. It probably had to do with his family being burned alive.

"Do as I say, Derek, or I'll have to punish you," Stiles said before lifting his head up and kissing Derek. Because he didn't have enough stubble burn apparently.