asubmissivestory:

Unless you’ve experienced this it’s hard to imagine just how diabolical this simple torture truly is. Look at his belly muscles involuntarily twitch. Her finger makes you ache to cum, but there’s not enough pressure to get you there.

And yet the finger continues to lightly circle the most tender part of your anatomy until the pleasure becomes pure torture, keeping you right on the edge with no chance of release and no possibility of escape.