I do estim for hands free and have gotten better controlling the current, the feeling is amazing and my cocks never pumped so hard specially to the point of no return!
I have done estim now for about 30 years.
I am using a signal generator app on my iphone, and then playing it through some old computer speakers. (aka SteroStim). One of these days, I will buy a dedicated estim “box”.
Most of the time I sit in a chair and have a mirror positioned just right so I can watch my dick get hard, bounce up and down, and then cum.
Last night, I laid on the floor with plenty of towels under me. OMG! It was insane. I had never felt anything that good ever, before. Mentally it was like my brain had gone to the planet Pluto. It was amazing and out of this world.
It is now 12 hours later, and I am still twitching.