what do you think about hayan from obey me?

ik you probably don't want your brain to rot but i've got nothing else to think about currently.
first of all, why was hayan kidnapped? like didn't mc's father literally sell mc to psycho seme so there technically would be no point to practice kidnapping hayan? am i just imagining that happened? idk i haven't re-read it in a long time.

secondly, is hayan trans or just a crossdresser? i'm sorta confused about this. i personally think she was trans because she says she wants to be a girl and she said she hated being a boy but others call her a trap or crossdresser (i don't really think it's nice to call her a trap).

finally, what's her relevance to the plot??? ik this should link to the first question but seriously what?? wasn't mc's struggles about being gay? is he actually bi then? would that explain how he fell for hayan before realising she was a man? isn't this supposed to be a shitty yaoi?? nothing makes sense?!? why am i obsessing over bad writing??