Squashed nose ass sniffing with a fart

This video has full weight facesitting, a fart and a ruined orgasm. I've reached my 4th night in these bike shorts and I am going to shower and throw them in the dirty laundr, but first I want my ass slave to inhale the stink they've collected. I strap him down in his box and really make sure he gets a big whiff. He breathes in hard and I ocassionally lean fully back and kick his dick around or rest my feet on it. Eventually I pull my shorts down and press his nose on my bare asshole, even letting out a stinky fart while I spread my ass. It ends with a big ruin but unfortunately you cannot see it on the camera angle.