[Derek's eyes fall to the same place Stiles is looking and he stares at his feet, the realization of how he made it back sinking in with that. And it brings Derek from anger over the possibility of Stiles harassing him, which he honestly doesn't put past him now that he's got control over his shifting, to sighing and sinking down on the edge of the bed.]

Okay, so the heartbeat thing...

[He rubs a hand over his face.]

I'm not staying here for the rest of the month, so maybe if you know that, you won't try coming over here in your sleep.