grab some toilet paper. wrap it around your cock. put your cock back in your pants (make sure your legs are together). and rub one of those BUZZZZZZZZZ message tools on your crotch. sometimes i have my cock upward instead of it being all cramped and curved down. i use an aerlang. i did NOT buy it just for this purpose btw. i use it on my neck all the time.

https://www.amazon.com/AERLANG-Massage-Massager-Percussion-Birthday/dp/B0DB86TWRJ