help me. this guy keeps asking for my nudes

so me and this boy were talking and he kept asking for pictures of my butt and iny bra and i gave it to him and he ss the one with the bra. he hasn’t showed anyone but still i got really paranoid thinking he could blackmail me cuz he kinda already did. he was like take the bra off or i’ll send your bra pick to this kid and it didn’t work on me but still. anyway he kept asking and i kept saying no and then i realized i could get something for blackmail from him. i told him no tit pic without his dick pick.

he finally gave in and sent a dick pic and i ss it. i was freaking out and texting my friend about it and it was freaky i didn’t even wanna look at it. anyway i put it in my eyes only and i hadn’t said anything yet and he was like send me ur shit

did u ss.

this was my chance. i said no i didn’t ss it. i didn’t even look. i knew he wasn’t gonna send it again. anyway he was kinda mad abt it but he kept asking for a tit pic but i said no because why would i send a tit pic if he i hadn’t even seen his dick. he agreed to let me just send a bra pic from the side and he keeps asking me for nudes everyday and i keep saying no and idk what to do anymore. good thing is is now i have some blackmail jic he shows anyone but still i don’t want him leaking the stuff i sent either and it’s rly embarrassing but what should i do if he keeps asking. also he goes to my school and is in my class so it’s not like i can just block him and it will be over with but i also don’t want to get adults involved. any advice