I've got an idea for a holding game suitable for 1 model. I don't know if this would be good, but no harm in posting it, right? The game works like this:
At the start, the model is desperate to pee, but she is in detention without access to a bathroom. Not under any circumstances is she allowed to wet her jeans (maybe give the model some kind of incentive to stay dry to make it authentic). She needs to wait until detention is over before she can leave and use the bathroom.
Here's the problem for the girl: She doesn't know how many minutes detention lasts, and she will NOT be told when the time is up. Instead, she must ask to leave (and hope detention is over by then). She can ask whenever she wants, for how many times she wants to. If the time is indeed up, she can go. If not, a punishment minute (or 2) is added to the detention time.
Please comment on this idea!