Its been a while and I forgot the problems in the story.

To his sister*

The sister was forced to transition.

I went back to check the twin’s dad forced the sister to transition but then broke up with her because it wasn’t what he was expecting.
2)The other guy is the younger brother of the sister’s stalker ex boyfriend from before she was dating the twin’s dad he is getting revenge for something
3) the seme “mad dog” is the one that took the pictures that’s being used as blackmail.