I suggest adding a slot machine to this so that the belt opens only if 4 identical symbols appear. And the game time depended on which symbols fell out. From 30 seconds to 30 minutes.
Since being locked with a vibration resistant cage, the only pleasure you could have was through anal stimulation. You resisted at first, but now you realized just how powerful the sissygasm was and you were on the hunt for the very best tool to do it wi
