抽搐的越多，就越痛。Estim免提高潮。

With my dick and balls connected to an estim box, the electric pulse feels like my groin is being whipped... my cock twitches in time with the pulse. The more I turn up the pulse strength, the harder my dick twitches. The pain and pleasure mix together as I switch among the estim pulse patterns. I edge myself as long as I can until I orgasm while my whole body spasms.