Responses
It's shown to be an accident. He was playing around with his friends, knocked her books off the desk, and was picking them up. You can see he gets knocked backwards into the desk, then in the next panel he's crouching and picking it up.
No way to know if he's a new friend or an antagonist or obstacle, but at the very least in the short term at least he cleans up after himself?
why was he going through her stuff? not cool bro