You spread the ass of your wife.
"Haha, surprise! Can you see it?"
"Can you see a poop inside my ass?"
"Ohhh.. smell it"
"Slide your tongue inside my ass and touch my shit with the tip of your tongue"
"Haha! It tastes bitter?"
"Lick my shit! This is your punishment!"
Now edge for my ass and for the sake of my shit.