I like to sleep on plastic
When I was a kid there was a plastic sheet to protect the mattress. I don't recall having a bed wetting problem. It was just there. When I reached puberty I found I liked to m********* by getting under my sheets and lie directly on it and hump away. It would get slippery and then I would c**. Then I had the problem that the slippery mess was all up my chest. So I used to have a towel beside me and I could use that to clean up. I thought I was really smart not making a mess or leaving any evidence.
Then slip out from under the bed clothes and get in between the normal sheets.
Then I used to do things like try to sleep on the plastic. I used to set myself these personal challenges to see how long I could sleep on the plastic. Usually sometime in the middle of the night, I would give in and w*** and c** and then clean up. Usually once I had c** there was no motivation to stay on the plastic.
FF a few years. Got married. Wife disgusted when I told her of my kink. It is this unspoken thing. Now when I travel for work I will go buy a plastic shower curtain for the bottom plastic drop sheets and sleep between them. I also like to put baby oil on me so it's all slippery. Same challenge to hold off as long as I can. Still once I c** I just clean up. With the oil it means I have to have a shower and wrap up the mess on the bed and dispose of it so I try to hold off till morning. Of course I don't sleep so soundly so usually if I plan to do this I will fly early so I can do it the first night and then have a day where I don't have to be alert all day. Do preparation work or visit clients where the meeting is short.