If you’re still stuck please let another message and I’ll give a more explicit hint :)
I've tried to drag and drop the girls there, but they don't want to go. I've tried while they are horny and when they aren't. I even tried to ignore bringing them to the boss for a while. I did notice that theres some symbol at the top between the bathroom and the top middle room, but I can't find a way to interact with it. I'll try to look a bit more.