My Nemesis and Hero is a BL visual novel by ChaniMK. It can be found on Steam and Itch.io. It's about a boy named Kai and his two childhood friends, Percy and Gavin, who fight over him constantly. Kai is kind of a dumbass and doesn't realize they're fighting over him or why until they confess their feelings. But each option expresses their love differently, so who should Kai choose?
I'm not poly IRL, by I love a good harem ending in a VN, so I played through the game 3 times, once for Percy's ending, once for Gavin's ending, and last for the coveted threesome.