"I have two jobs, it's only fair f you got two, as well." It made sense to give Percy an occupation that would keep him busy and the interior decorating biz was about as slow as Oli's broom making, although he couldn't complain. It gave him time to learn about broom making before he actually got in a request.
"Over exert myself? I haven't been here for that long, I'm still in shape," Oli said. And he regretted it immediately. Percy had given him a great opportunity and he hadn't used it.