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My Girlfriend's Girlfriend and I by aj_linguistik
Fandoms: Sword Art Online (Anime & Manga), ソードアート・オンライン - 川原礫 | Sword Art Online - Kawahara Reki
16 Apr 2026
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Summary
Things Kirito and Sinon have in common: Asuna as a girlfriend. That's likely all either would admit to, in the very least. And their friend group wouldn't jump to say that they were in love with one another even though they were both in love with Asuna. There was a mutual understanding. Asuna was their girlfriend, but Sinon wasn't Kirito's girlfriend and Kirito wasn't Sinon's boyfriend. But after the slip-up of the century, Kirito starts to wonder if their mistake could push them closer together to make things less stressful on Asuna. Could he get along with Sinon in a way that wasn't just as a friend and mutual partner of Asuna? Could the two of them possibly be something more in this polycule?
With this kind of mistake, there was only one surefire way to find out.