I'd say a fantasy of mine would be to meet a girl that's cool to hang out with, who has a beautiful bitch. We'd hang out, and once she is confident that her girl likes me, she asks me if I would like to date her dog (because it turns out her thing is she likes men with dogs). And from then on we go out and about on dates with the three of us- two as friends, two as lovers- and with the girl acting as the human proxy for her dog when we're in public.