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"Also: Sprite and I have finally, I think, settled the terminology question of what to call our relationship. We're not really girlfriends with each other. But "my boyfriend's other girlfriend" is cumbersome and indirect. Apparently common poly terminology is "metamour," but eh. Or "paramour," which is kind of clever except it's already a word.
Anyway. We are "sister girlfriends." (via http://pervocracy.blogspot.com/2011/01/quiet-night.html) ‎· псы в рапиде
"peer girlfriends" ‎· 9000