It was normal for teenagers to think about sex. Stiles knew that, and he was surely not the exception to that rule. But because of that, he liked to consider himself normal - at least in the aspect. But of course Scott just had to go and say "beastiality". Okay, so maybe Stiles could once had considered himself normal, but he had to admit that chemistry was more a bitch than usually when all he could think about was how Derek's claws could feel against his skin. That day, Stiles got a normal detention for not paying attention in class.