need help findign a manga

i remember finding it a while back on i think nhentai. i cant find it now but i remember stuff from it. 2 girls meet up with a guy from a suicide forum or smth and they want to commit suicide together. one girl made masturbation vids and got found out by kids at her school and the other got bullied cus her tits were too big (they called her fatty). they wanted to lose their v card b4 dying so the first girl just gives a bj to the guy and he films her saying he will kill he rfrom suffocation, until she passes out. i dont remember hte rest that well to describe but i need to find it so if anyone knows lmk