@Mashii52 i think you could say the 2 selfs of him are complete diferent persons after this chap so more like a shared body than transformation?if so its not gay
Why are you all saying she's yandere? Care to explain? It clearly says in the first chapter that the affection towards his best bro is magnified whenever he turns into a magical girl so it's only love. How is this a yandere (obsession)?
Heres a thought, what if he/she had sex with his/her form with his bro and she stayed in her form for 9 months of preggo then transformed back to a man. What happens to the rider in that mecha suit?