Open relationship: A relationship in which two people agree that they want to be together, but can't exactly promise that they won't see other people too
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"So let me get this straight you're going out with my sister?" I can barely even comprehend what was was happening right now my best friend since birth is practically dating my sister, my twin sister out of all the people that he could've chosen in this world he chose the girl who was my sister.
"No idiot, I'm in an open relationship with her it's like friends with benefits but better." He replies as if that explains the whole situation right now, I continue staring at him my eyes expanded to the maximum.
"So you Michael fuckin Clifford are in an open relationship with my sister Nicole?"