Fics like Places in spaces in time in art

In the future, Mafuyu and Ritsuka are really, truly happy. Warnings: This entire thing is in Mafuyu's POV. Lots of mentions of Yuki. The future scenes are interspersed with a scene from the past (namely, our dudes' first time). There are mentions of almost every other character--they just don't appear. Except for Yayoi. (And Kedama.) Includes sex, but no graphic depictions.

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