... honestly, author might be surprised how many geek girls are like this once they feel comfortable enough around you. Give her open fart privileges and generally just be a good bestie and you can live this arc without needing any genders bent.
Man, this manga has made me confirmed that the city has more succubi hiding in plain sights. Those who have succubus mom would have son to be TS or daughter being succubus at certain age. Why can't we go to that city?