Small pause, have you added the time? good, 100 strokes, no cum!
50 slaps
then 50 strokes
then 50 punches.
100 strokes now, by now you will not do it anymore so enjoy them, but NO CUM!
re-start to sit on the balls, sit as I am, when you have all the weight above start pushing with your feet to bounce over, bounce on your balls, take the time, do the sum I recommend!