Since he probably lives close by...go by his house at night or when he's in school and get handshakes to crack his wifi. If you can't get it immediately, you can hide a pwnagotchi or some other kind of raspberry pi drop box then pick it up later. Crack the hash, get access to network. If you can gain access to computers...well, you could plant some bad shit on there and turn him in to the feds, or just put a RAT on his machine and do whatever you want. If you can't gain access to his computers, you can always try doing a MITM to capture some passes and cookies to then gain access to whatever accounts he has. If he has a garage, you could probably use a HackRF1 to capture and playback the code to open the garage door...giving you access to the house, or you could just drive by every day and open the garage door so burglars can steal whatever they want.
Having said all that...if it was me I'd beat the shit out him, force feed him some shrooms or a drop of acid, then drive him out to the middle of nowhere, strip him down to his underwear and leave his ass there. Oh, and write RAPIST on him w/ a sharpie so he gets to explain that part to his parents / cops when he sobers up. Doesn't matter if the fucker is 14 or 50, you rape somebody you're gonna pay for that shit.