My gf is bi and she's in a loving with another bisexual girl for over a year now. I was always ok with their relationship. They both treat me wonderfully and it does not affect my relationship with my gf. It's very loving, passionate, lots of sex and romance etc. Her gf adds a lot to it (for the better). Aside from the frequent fights they have, they both display extreme passion for each other. Anyway, overtime I find myself falling for my gf's gf (weird to say I know). We often have talks about the 3 of doing things together, almost like we're all equal partners in this relationship. My gf certainly does not mind if me and her are together. She recently admitted she wanted us to hook up and that it would make her happy. Also at the same time, I find my self loving both of them in very similar romantic ways. This is exactly what my gf wants. She want's her to live with us when we're married and even wants me and her to have a baby. Honestly, it seems almost too perfect and the dynamics and personality clashes actually mesh very well (almost too well). Both women are extremely attractive and both treat me like their bf when out in public. Honestly, it seems too perfect for all of us involved. So........is this realistic? Is this sustainable? Anyone have first hand experience with this?