The mechanics of someone releasing it into your butt
I'm planning a session with my 25th different domme for FTT, and I wanted to try something special. I've done packing years ago (which I also attribute to getting a painful anal abscess, more on that later for anyone interested), but this time I wanted to try something cleaner, hopefully much safer than aggressive packing, and more direct.
I'm thinking of using a large diameter hollow butt plug, getting under her scat chair, and letting her literally poop inside of me. If I'm relaxed and already lubed from a warmup, would the only real muscle offering resistance be the sphincter, which would be fixed open by the plug? I don't imagine it going all the way in, but even part way would be hot. For the record this domme is known for producing long, hard turds.