I know that feels really good as I do something similar. I loved when your cock started bucking trying to escape its bondage and then finally shooting its cum while bucking and writhing.
I use this as a torture for my two shemale slaves. If they have been caught masturbating or sucking each other or anything else that is forbidden I tie them on their knees hands behind their backs. Their knees are pulled open wide and then I make them hard, after which I tie a very tight cord around the base if their cocks to keep them hard. Then I take an irritant powder and brush it onto their glans. I wait a few seconds and then they begin to moan as the powder starts to work which is when I begïn brushing the glans lightly. This intensifies the effect of the powder as the glans is now hot and inflamed. It is sheer agony which I prolong into an edging exercise. Eventually I take each cock in my hand squeezing it tightly and then I brush it fast across the glans which always results in a hard painful cum. Fantastic punishment!!