late reply, but u have to go the nagisa route (blue haired girl), you will get a branching option to have sex with nagisa in front of aihara or mind control her more (make her eventually fall in love with u) You chose the first option.
After the deed is done, you will get the option to make aihara only be attracted to ugly woman and to let himself pig out and fuck off. Or you can chose to fuck with him and make him dress as a girl and get breast implants.
the 2nd obviously leading to the gender bend