A disgusting punishment that I dish out to my girlfriend is not letting her wash her asshole or wipe properly for days. Not only does it drive her nuts because she's a hygiene freak but she gets embarrassingly itchy. Apparently her skin can't handle being a little dirty. She's constantly digging at her asshole. No regard for what we're doing. I find it hilarious, especially when I have to scold her in public for being disgusting.
"Sarah, honey, two people have noticed your hand digging between your crack now. That's very gross behavior, please stop embarrassing me."
To top it off I make her worship my asshole everyday of the punishment. She gets so jealous that I have a clean asshole and really helps her feel more disgusting.
"Really rub your tongue up and down hard and fast like you're trying to itch your own asshole, sweetie."