"What?" Stiles says again, pushing himself up a little more so he can see what Peter's talking about.

He couldn't have hurt Peter physically, the man's a goddamn werewolf. Yet, when Stiles sees the little angry red mark on the man's neck a sudden thrill goes through him, leaving him breathless as his eyes widen in shock.

Staring at the mark, where he'd bitten and sucked at Peter's neck the night before, he reaches out with a shaky hand to touch the mark himself, then looks at Peter's face.

"It stayed? I- how?"