I will be honest and say I've never participated in either (unfortunately, lol). But I do fantasize about both of these scenarios and I don't think I could pick a favorite. A threesome is hot, and as a bisexual female, the components of that threesome do not matter! I enjoy both equally in my fantasyland lol.
Well as Well as for me I'd preferMFF. Is fucking awesome having another set of pussy and tits and just one cock. Two girls fucking each other while he shakes his cock. And I love a women squinting her juice all over my sexy body.