Do some of Ya'll know about a japanese school romance manga that started with the MC being...

Do some of Ya'll know about a japanese school romance manga that started with the MC being a boy I guess but he eventually turned into a Girl and and there is the ML who the MC don't like him as MC sees him as a Rivel since he's always the Top in school, I don't exactly remember what happend but when the MC turned into a girl, the ML just straight up bring him into his room and straight up have sex with the MC btw, the MC has Long Brown Hair in girl form and the ML has black hair