Fics like Metamorphosis

A chance encounter with a familiar-looking girl leaves Sei questioning the one thing she was most sure of, and leaves Yumi completely stunned at a bizarre turn of events. An exploration of the ambiguity of soeur relationships and romantic relationships in general, with a particularly close look at Sei/Yumi, Yumi/Sachiko, and...a slightly unusual pairing. (By the first chapter, you'll know whether it's for you or not, haha.)

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