On the outskirts of the Everfree Forest, not too far away from Fluttershy's cottage, there lies a picturesque pond with a surprisingly gentle waterfall feeding into it. Behind this waterfall, a hidden grotto keeps itself a secret from prying eyes that may hope to defile it.
Fluttershy is the only exception.
When she needs some time to just get away from it all, she sometimes comes to the grotto to rest, reflect, and relax on her own. There are few places in Equestria that can replicate the sense of peace that she feels there, and she's glad to have it all to herself.
This makes it all the more worrying when, on one of her usual visits, she realizes that she's not alone.