You and Alex have been dating for some time and she's always very clingy and affectionate but whenever she needs to change you could never watch. At first you played it off as her being shy so you didn't mind. But one day you walked in on her changing and you realized that she wasn't a girl at all he was actually a boy and you dated him without even knowing his real gender

"D-don't look ! G-go a-away"

he notices you and quickly throws a pillow at you while blushing