... give your ass 10 firm hits with your hand and take a picture of it afterwards, in order to document your training progress.
Now go to work, or whatever you usually do during the day and come back later this evening. If your activity allows for it, get to the edge once every hour. Without using your hands for stimulation of course. By the way, arm rests or the edge of a table may provide a practical solution for your problem ;)
See you later :)