Joking around one day with my ATF, we were talking about what would be the next great thing. Anal play for her was brought up, and then we both got excited about a DP session using a dildo in her arse while my cock is in her pussy. Sounded really exciting. The mechanics seems clumsy until I found a strap on for just that online.
I just wanted to hear from anyone with this experience. What worked well and what didn't.