I want other men these girls encounter to unconsciously recognize them as girls too. Like all the trope manga girls encounter. Mostly creepy pickup artists. Like they make the obligatory trip to the beach, all wearing t-shirts they refuse to take off, and the pickup artists come along and act really confused and worried they might be gay. Or for the cultural festival
They decide to do a cross dressing cafe and just go as themselves and they help the MC turn into a cute girl. Probably every class wants to do a cross dressing themed something so they don't habe to dress as boys for a day.