Stiles presses his fingers against Derek's chest, able to see the wound is healing but still not liking that Derek's obviously lost a lot of blood and seems fine with it. He can feel the wound closing slowly against his skin and it's weird, but... well, yeah, it's pretty freaking awesome, too.

Werewolves, man.

He bites his lip when Derek brings up the night at school, not really knowing what to say. Things were different back then, but it still doesn't make leaving Derek there any more right. At least he can help now.

"Hey, well you don't have to drag yourself anywhere this time." He pats Derek's chest, a little awkward. "If you need anything, I'm here, big guy."

This is probably weird. Derek probably wants to punch him. He pulls back, embarrassed, and goes to get a bottle of water from the fridge, coming back and sitting next to Derek again with the bottle extended. "Drink this, you suicidal moron." And back to cleaning off the bites.