Stiles knew he had did the wrong thing when Derek froze and handed the cloth over. Even though he was bone tired and all he wanted to do was sleep Stiles started to clean himself knowing Derek was finished with him.
He was surprised when Derek finally spoke up and he turned his head slightly even though it really didn't give him a better view of Derek's face from where he laid against the werewolf's chest.
"I liked it," Stiles spoke, his voice soft, "and I'm sorry."