Favorite predicament bondage I’ve come across: Person locked on their hands and knees, one dildo in front, one in back. They can relieve the pressure in their throat if they slide backwards onto the one waiting behind them, and relieve the pressure behind them if they slide forward and take the front dildo all the way down their throat. Pretty soon trying to find “relief” from their predicament turns into throwing themselves back and forth for a different kind of relief.