*hands Beaver Eager kevlar suit* Welcome to the club. Take it like a man. ;)
I do the same thing during my before bed girth routine. It’s one of the exercises I do religiously now. It feels awesome and the pump is unmatched. BUT, if you do this to yourself and you are NOT PREPAPRED you WILL hurt yourself. I am not suggesting that anyone try it. I am just saying it works incredibly well for me.
And Beaver, the little bumps is always my sign that my jelqs are working the best.