Are those balls feeling a little sore??? Good, and dont think those nipples are going to be getting a rest either!
I think its time for a little more stroking, but first why dont you go ahead and twist those clothes pegs on your nipples 90 degrees and hold it for the count of 20 before letting go.
Now set that metronome to 144 and stoke at that pace for two changes of your pc clock.
Now twist those nipple pegs 90 degrees again and hold for the count of 20 before letting go.
Now set the metronome to 184 and stroke at that pace for one clock change...
When you're done, I want you to bring yourself to the edge and hold it for 10 seconds before continuing.