Gf and I with big toys in both of us in the pool goes wrong

My gf and I are very open-minded and enjoy the same thing. We had the idea to go to the pool with toys inside us and give the other one our remote to play with. She used a xl tentacle egg plug in her pussy and put a lush in her ass. I decided to take a new toy we just hot, which is an inflatable prostate massager plug that has a crazy intense vibration. We got to the pool and realized that theres too many people, but she insisted we still go for it. As i got in the pool, we found a corner and had some drinks and started to play with the remotes. We were both jaw dropped just from both of us already being stretched and trying to hide it.

The problem came when i tried her remote. It turned on for a split second and then nothing. We kept trying and assumed the water in the pool messed it up. It was still fun to watch her whole the huge tentacle egg stretched her every time she shifted. Then she tried my remote. She pushed the button and asked if it was working. The inflatable part started expanding inside me right up against my prostate. Then she hit the vibration button, and i spasmed. My cock quickly swelled as my ass was getting stretched. I felt like i was already about to cum and asked her quietly to turn it off. After a second, it was still going, and I started to panic. She kept trying, and nothing was working. Suddenly it stopped and I was realised. We put the remotes under the towel and just relaxed. We both realized this was incredibly sketchy. Suddenly, my toy turned on again. It started cycling through vibrations and was taking in water and started to inflate by itself. I felt like I was gonna cum for 10 min. It just kept stretching me. Now i couldn't get out because others would hear the vibration. My gf was having fun watching me and sat on my lap while my cock pushed the xl toy deeper in her pussy. We were both losing our minds when suddenly my tip slipped in her ass as my prostate continued to get punished by the vibrating balloon. I grabbed her hips and slammed her against me as i felt my cock finally erupt and pump her full of hot cum. She moaned loud for a second, we both completely forgot where we were. After we both relaxed we ran out of the pool and back home. After we left we realized that everyone totally knew what was going on.