Re: 15th
It was a good thing Stiles' didn't have superhuman hearing. Derek had swaggered off to the bathroom, even his imminent blue balls not enough to bring him down from his high of knowing Stiles had finally faced the truth of his desires. But right as he got the bathroom he heard Stiles' moan and it just about made Derek slip on the bathroom floor, only the sturdy tub stopping him. "Jesus," he muttered before collecting Stiles' clothing.
He moved quickly, nearly jogging in his effort to return to Stiles' room. Throwing the clothes to the floor, he huffed as he watched Stiles touch himself with enthusiasm - a first since Derek had bought him.