Re: Bathroom
Derek had noticed when Stiles disappeared--when did he not notice everything about Stiles? He was attuned to him, by scent, and instinct--as well as some of the picnic food, and he noticed when the boy returned. If there'd been fewer people around, it probably would have been more difficult for him to sneak in, and for Derek to sneak away, but in the chaos of so many bodies in so small a space, the werewolf trailed his slave easily.
He entered the bathroom behind him, and shut the door behind them both, leaned against it, arms crossed over his chest, and raised an eyebrow expectantly.