I recently bought a knockoff of the Tenga Egg. It's a small masturbation sleeve made of very stretchy rubber and is about the size of an egg. Add some lube and you can slide it up and down the length of your shaft. Like most masturbation sleeves, I found the inconvenience outweighed the pleasure factor.
I did rinse it out and decided to keep it, thinking it might come in handy as a reusable cum receptacle if I should want to stroke off at my desk. One night while playing around, I got the idea to stretch it around my entire package - flaccid cock and balls. I actually found this pretty enjoyable and comfortable and the base gripped snugly similar to a cock ring - though not as tight. I put in a butt plug and put my sweat pants back on and spent some time on the computer, enjoying the feel of a nice cushioned package between my legs.
A bit later I need to pee, but decided to hold off a while because I was still content with the sensations I was having. That's when the idea entered my mind of what it might feel like to let go inside of the egg. With that I fetched a bottle of water and set about intensifying the need to pee.
When the need to go became greater, I made my way to the bathroom and straddled the corner of my pedestal sink. For me, the erotic part of peeing comes when your about to do it in an unfamiliar fashion with uncertain results - and definitely hands free. I like to relax to the point of almost releasing but stopping just short. I mentally put myself in a state where I'm slightly inhibited to let go, but know how good it will feel when i do. Not knowing how the stretchy rubber cup would react to being filled helped me achieve this delicate state of mind. Would it just force the urine out of the top? Would it just pop off into the sink?
I focused on relaxing right to the edge of releasing and found the delicate balance where ever so little was escaping in short intervals. I found this state to be subtly and delightfully arousing. As I released more, I was pleased to see that the base of the cup was staying sealed as the cup began to slowly fill and expand. The warm piss began to surround my cock and balls and freed them from the restricting contains of the rubber egg. I cupped my hands beneath the growing bulb to support the weight and the warmness surrounding my scrotum pushed me beyond the point of control and the urine left my bladder at full flow. That moment of submission is the brass ring of the exercise for me. Similar to the (psychological) feelings you get when you can no longer put off orgasm, ore can no longer retain that high enema - they only differ in intensity and reward.
I was amazed at the volume of pee that the egg expanded to accommodate before it slowly began to trickle out around the base ring, still nicely in place around my package.
I touched a few drips of the pee to my lips to evaluate the flavor. Slightly salty without the bitterness I expected. My cock had swollen modestly from the event and I stretched the base of the bulb and gingerly allowed the pee to flow out and into the sink. Since I was moderately aroused, i went ahead and jacked off my piss soaked cock and balls to a satisfying orgasm.
It wasn't an intense sexual experience, but it was enjoyable and interesting. I wouldn't rule out repeating it at some time when the mood strikes me. I think it confirms my hunch that I would enjoy watersports with the proper partner. An unexplored curiosity of mine.