Y'all remember,Grayson is twisted in the mind. In his head he wanted to help the kid with his punishment by staying with him so he wouldn't be alone. Yes Grayson is an a**e. But by reading his story we understand the "normal" for him is very twisted. So,he tries his best to be as "normal" as possible by doing his own thing (even though it's fucked up). In Grayson's mind he just wanted to help