za Armtes :The idea is not to inject another guy's cum, much less urine into the bladder, it makes no sense, the idea is to masturbate while the other guy also does it and when he reaches in your urethra, expel his cum through your cock and feel the feeling that you are ejaculating the other guy's cum, and then to ejaculate your own, that is, ejaculating twice
Ngl this is a hot idea. Not only can you do it with cum, you can do it with piss and fill in the other's bladder and vice versa. I'd definitely love to see the implementation of it
i want to try it and let the guy piss inside first then blow his big loads into me filling my bladder up then jerk off with his cum n piss inside my bladder