sexual harassment? intentional

Hiii I posted recently about a student consistently telling me “my balls hurt” (I deleted the post since the situation got handled) but I fear this student strikes again. Today I walked in between him (he was holding a piece of paper) and his friends to get by my desk and I feel a tap on my butt when I’m walking by him. I get caught off guard and I look at him weird and his response was “what you walked by my paper”. I’m not too sure if the little ass tap was intentional or not but based on the behavior it feels like it. This past week, he’s already asked why I’m looking at him weird and acting out when I don’t give him attention or space. We’ve both mutually pulled away too, and the student also asked me if he would get in trouble before telling me a ball related story!! I need insight!! Help!! Also I know I should report this despite my co teacher already mentioning his overall suggestive behavior to his parents. EDIT: not sure if this adds anything, but I’m in my early 20’s working with middle schoolers. This kid does know I’m a little bit younger and I do act like it too.