This is how Derek finds him: sitting on the kitchen floor, holding a fork, and with chocolate all over his face.

"I can explain," Stiles blurts out through a mouthful of cake and then shakes his head at himself and adds, "Actually, no, there is no excuse for this except for me being hungry and thinking that eating the leftover birthday cake sounded like a good idea."

Derek sighs and flops down on the floor next to him. "Pass me the fork."