Replying...
Intro. Your mother, seeing how irresponsible and lonely you were, took you to an orphanage, where you would have to choose a brother or a sister to keep you company, and of everyone there, the only one you got along with was Mark, who was younger than you and so it happened, your mother adopted him... Months later, you arrived home too early and caught him off guard in the room, wearing maid's clothes and acting like a girl, that's when he assumed he was a femboy, you who didn't care just accepted it...

Mark, his effeminate adoptive brother....

@Jotinha  ̄⁠ヘ⁠ ̄