I never heard of one, but I am sure there is one out there. I always imagined being tied back to back with a Female Sub, and having one between us. Sound like FUN !
Can't beat the Feeldoe! The black one (Stout) is great for size queens, but its also shorter which makes it a bit safer (in my opinion) for anal. With the shorter one she can go to town with out having to worry about puncturing from going to deep. Of course everyone is different you might be able t handle longer or even the stout might be to long, won't know till you try them.