Welcome! You appear to understand that there aren't many single, bisexual, women seeking a couple for a polyfi arrangement. You won't run away if we order up a round of beers and sing the song? That would be fun!
Seriously, as I've pointed out before, I'm quite happy for the folks who beat the odds. All of the polyfi triads I've known, however, came about serendipitously. The couple wasn't necessarily looking for a third and the third wasn't looking for a couple. They just fell together that way.