Responses
If you don't mind the fact they're in high school, try Deri Pocha - Yajuu no H na Gohan
The top does lose the weight, but he gains some of it back by the end and overall it’s a very cute story: Shinnyuu Shain no Omega desu ga, Senpai Alpha Kaizoushimasu!
I can deal with a lot of shit, but fatphobia? Nah. I deal with that daily don't want it in my silly little bl too. If anyone has any recommendations of BL with fat protagonists who dont get thin and/or dont get with a fatphobic bully, please share