I'm glad you enjoy the detail I put into my work. Sorry abotu the delay in answering, but I didn't have internet access for the last couple of days. Anyway, here's what I've got on Zack.
1) Zack's surprisingly vanilla when it comes to sex in this AU and what he really enjoys best is gentleness. He puts up with cross-dressing because Aeris enjoys it, and does the 'innocent maiden' act because she's always careful with him when he does that. (Although he also likes letting her 'seduce' him.)
2) Zack isn't friends with Sephiroth in this AU, in fact he barely knows him because of how focused Sephroth is on Cloud.
2a) He is however friends with most of Cloud's guards, so he picked up on their sympathy for Sephiroth, and gets why they like and adore him.
3) Zack lost contact with his family after he was found to be one of the children Hojo enhanced just after ShinRa fell and he was taken as a slave and he never thought about trying to get back in touch with them later.
Re: Level of detail
1) Zack's surprisingly vanilla when it comes to sex in this AU and what he really enjoys best is gentleness. He puts up with cross-dressing because Aeris enjoys it, and does the 'innocent maiden' act because she's always careful with him when he does that. (Although he also likes letting her 'seduce' him.)
2) Zack isn't friends with Sephiroth in this AU, in fact he barely knows him because of how focused Sephroth is on Cloud.
2a) He is however friends with most of Cloud's guards, so he picked up on their sympathy for Sephiroth, and gets why they like and adore him.
3) Zack lost contact with his family after he was found to be one of the children Hojo enhanced just after ShinRa fell and he was taken as a slave and he never thought about trying to get back in touch with them later.