Biggest Load On Human Toilet

My slave is handcuffed and helpless. I've been holding it in for four days straight. I sit down on his face with my big sweaty ass and push out the biggest shit I've ever taken - right into his mouth. It overflows the sides so I scoop it back in. He starts backing up and gagging hard from the smell and the taste. Then I felt a post-dump fart coming, pushed it out, and another even fouler smell hit plus a more runny turd came straight out of my big ass. I'm having the time of my life making him take every bit of it.