God we've nearly broken you boy. Place the clamps back on, but rotated 90 degrees and then attach your vibe to your cock head with a band and turn it on high.
Turn your stim back on to max power, medium high width and low speed.
Snap each freshly nipple with a thin band until you dry heave into your condom. Turn off the vibe and estim as you begin to leak, but keep snapping.
Who knew pain could milk a boy so thoroughly?