Did I respond to this thread? Guess not. My DL fascination started with messing from an early age after being constipated often as a kid and having some messing accidents. I eventually graduated to intentionally messing my pants in the bathroom or room and enjoying it. Everything about the process I love. Feeling the urge to go #2, the contractions hitting and getting closer in between and more intense, the relaxing as you start to feel the load starting to go down your sphincter to exit the pants (or diaper), the pushing that slowly intensifies as you start to feel the load crown out of your sphincter and towards the seat of your pant/diaper, continuing to push as you begin to finish and the last of the poop drops down, feeling the weight baring down on you as the load sits in the seat of your pant/diaper, the relief you get from finally letting loose, and finally, sitting down in it and mashing and enjoying it.
Call me weird, but... I know I'm not the only one that likes it. Clean-up is whatever, I'm used to it after 20+ years.