Maybe he took hormones, I mean even his face is very feminine.I think Mangaka is lying to us, I don't believe anyone AMAB would have a hip shaped like that without several years on hormones.
Lol, just when I thought as well. Now looks like Kei is going to take advantage of Yo in his emotionally vulnerable state. Showing him such kindness only to... "surprise!!!!"Dude...this girl is really crazy. Why keep fooling around like that and treating him like crap? Just give her up and go the gay way, you can change later (but i bet it will be hard). Just when i thought things were pretty normal, Kei surprises me with this shit...~