My favorite was the first time I ever used an adult diaper. Full disclosure, I have no interest in adult baby related stuff. I wanted to try diapers as a way to wet myself with no clean up.
I ordered some online, and the day they arrived I got myself good and desperate. I drank water until I was bursting, and I put one of the diapers on. I had gotten really absorbent ones because I was afraid of leaks, and it felt huge and bulky on my ass. As soon as I put it on, my urge diminished a little. I still could feel the heavy pressure of my full bladder, but I didn't feel like I was going to let loose any second. I guess I'm not used to peeing without a bare pussy.
I sat around in the diaper, drinking more and more until I knew I couldn't hold it anymore. I tried to pee sitting on the sofa, lying on the bed, sitting on a chair, and standing. No matter how bad I had to go my mind just couldn't let me piss.
I went into the bathroom, standing in front of the mirror. Being in the same room as the toilet did it, and I started to pee. A slow trickle came out, and I felt the first splash of liquid. Then the floodgates burst. I leaned forward over the sink, moaning with relief, while my piss flooded out into my diaper, the warmth rapidly spreading across my pussy and ass.
I have never felt such pleasure while pissing as I did at that moment. As soon as I finished going, I lay down out of breath for a minute, before tearing off the diaper and rubbing my clit like crazy.