Stiles froze when he heard those words slip from Derek's mouth. He hadn't been expecting to hear them and it shocked the human a little. But then he was reminded that Derek was currently poisoned and clearly thinking of someone else.
"No you don't but it's ok. No one ever did back in the camps either," Stiles said feeling pity for himself as he reached out for the shampoo the Hales had supplied for him and squeezed some onto his hands. He then went to work lathering up Derek's hair as the werewolf nuzzled him.