As they were about to leave the restroom, the door opened and two girls walked in.
"Excuse me, this is the women's restroom," one of them said. "Boys aren't allowed in here."
Then the other girl leaned towards her friend. "Uh, I think they're girls," she whispered. She nodded towards Joy's crotch, which was devoid of the bulge that would be there if Joy were male.
"Oh ... uh ... sorry," the first girl said, then moved on towards one of the stalls.
Joy looked at Alison, who looked back with an uneasy look. They may have looked like boys now (with long hair), but they were still girls. Girls with flat chests and flat asses, but still girls. They needed to find a way to became fully male again.