>>42520757
As a Flutterchad I am extremely biased, however I think that if her R63 version kept her personality, I could deal with having sex with her and only her while being Anonmare without psychological torment, because her personality is so quintessentially feminine.
My preferences go like this: Anon + Fluttershy >>>>> Anonstallion + Fluttershy >>>> Anonmare + Butterscotch >>>>>>>> Remaining separate from her.