Another one was with my ex on a nude beach. This happend without consent, but she was showing her pussy several times to a guy she maybe interested in. After some time she asked me to set some sunscreen, so I told her to ask her new friend who was laying on a towel just 10m from us. She didn't ask, so I did (although we didn't had consent, what I'd seen had turned me on). The guy accepted and after some time of really setting sunscreen he was fingerfucking her.