Start stroking. No lube, no cumming, no stopping.
Stare at me for 5 minutes.
If you get to the edge, slow down a little, but don't stop. I want 2 edges in these 5 minutes.
After the 5 minutes, guess what happens?
That's right, nipple clamps on again.
Rip off as fast as possible. Don't hold back.
And on again they go. 90 degree rule.
Start stroking again. Do not stop until I say so.