"I do work for them," Terrence corrected. "So? That's what makes it fun. Everything I do is for amusement."
He supposed he should explain better than that, although that was the driving reason behind doing what he'd done. Well, the fact that it would be hilarious, and the fact that he hated the Headmistress. Funny, really, that most of his hatred for Umbridge had stemmed from wanting to torture Anthony, but Terrence loved irony.
Still, he was silent for a moment, considering what might be best to say. "I like to make sure my partners in crime are never caught," he said. "Habit of mine. Had a lot of experience with it, too." He laughed. "The way I see it, either I can help you on your way to becoming a completely bad arse outlaw, or I can modify your memory to make sure that if you get caught, you won't be able to lead them to me, and let you run off. Which sounds more fun to you?"
The former definitely sounded like more fun to him, especially since the other boy's humor had already had him in stitches. When they got back to his place, he was going to get them both a celebratory beer and sit back and laugh forever at what ensued. Assuming Anthony was amenable to that plan, of course.