I deliberately chose to train and expand my anal muscles. I derive pleasure from having my waste entered into the mouth of a submissive, who then chews and swiftly swallows it, attempting to keep pace with my bowel movements. I never realized that anal training could be so delightful. My partner inserted a stopper in my anus and began to play with it, pushing it in and pulling it out. He then donned a large black strap-on, and the pleasure of feeling him inside me, stretching my anus from within, was indescribable. I reached orgasm and involuntarily urinated from the intensity of the sensations. However, this was not the end. The orgasm and pressure in my anus triggered the urge to defecate, and my waste began to emerge, but my partner did not allow it to exit easily and instead had intercourse through the waste. At that moment, it felt as though he was reaching my very core, and I thought I would lose my mind from the overwhelming pleasure.