I love this type of stories because it ends up tackling gender identity, sex and sexuality. Mao still identifies as a girl (not entirely though, I think) so she is straight. The Ml is giving big gay vibes, since he is assuming that Mao is a guy and identifies as such and if he actually ends up liking femMao, then big bisexual vibes. If then Mao starts crushing on a girl and she still identifies as a girl despite being in a dude’s body, she is also big bisexual. WE LOVE TO SEE IT