Rimming strange hairy sweaty ass.

We have no experience in scat nor fart, we are more into humiliation and extreme cuckold play. But my wife has recently this fantasy that turns me on so much. Namelly fantasy goes like this- she meets a stranger guy on the disco. She is drunk. Me too. He is dominat and starts to kissing and touching her. Then he takes her to his male friend. They are also drunk and came up with this idea- it's theirs one night slut. So they want to have fun. They make her lick all asses of this male group. When she does it, they humiliate her in front of me, by farting while she licks. Any ideas what humiliating we could add to this fantasy in area of farting and maybe scat?