A cry was ripped from Stiles' throat as Derek's hand came down hard, really hard, and Stiles moved every moment of it. He was completely hard, straining against his pants that were half pulled down, as Derek continued to spank him.
Stiles' hand dug at the earth around him as he moaned and cried out with each smack. "Please!" Stiles begged though he didn't know if it was for Derek to continue or stop. Each smack is was becoming more painful which was bringing on more and more pleasure. "Please, Derek! I'm sorry! I'm so sorry!"