Fluttershy has a secret she's been keeping from her friends. When Celestia finds out, Fluttershy is worried—but, as Celestia reveals she's got a secret of her own, the two of them take to meeting once a week to share their common plight—and, along the way, to explore Fluttershy's fascination with Celestia's wonderfully shaped royal rump.

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Based on this picture (too saucy for Fimfic cover-art!)