"I was getting into position!" Stiles protested as he turned around, setting on his back with his legs spread and his fully hard cock pointing upwards. "See? If just took me a bit. Had to smell some roses along the way... Master."
Because even with all of Derek's reassuring words when Stiles heard the word punishment he thought back to Eterna and what had happened when he didn't listen. He didn't want that to happen again. Ever.