Ugh, I hate this. 'we want two guys to fuck so we'll forcibly turn one of them into a girl and ignore everything and anything about potential body dysphoria and downright trauma it might cause instead of tackling said trauma or making it gay'.
Granted we don't know if the guy wasn't questioning, but still--he probably wasn't, so the least they could do is make it a story about his severe dysphoria caused by the shift, and maybe a quest to regain male body.