Favourite DL activities to do with someone

I'm trying to find new things to do with my amazing friend when we're both diapered. Diapers aren't really her thing and for the most part she's just indulging my fetish. That being said I'm fairly certain that once in a while being diapered together is sexy for her too. Looking for new things to try is partly because I love trying new things but what I'm really hoping for is to find something that she's really into doing together.

Any and all ideas or thoughts or fantasies would be appreciated. We're not really into the AB stuff but anything is possible so I wanna hear it all! I'd also love to know what's sexy about being diapered with or without someone else for women because I know that what I find exciting about diapers will more then likely be completely different from what she might like about them.