With a whole day off, Rainbow Dash has nothing to do. The only pony that doesn't seem to be busy is Pinkie Pie, who doesn't seem to be herself. The two decide to bake cupcakes together, but something else rises as well...

Rarity has always admired Fluttershy for her beauty, both inside and out. Fluttershy has had a crush on her generous friend for years. They both become nervous wrecks on the inside when they see each other, unbeknownst to the other party. But after one of their spa dates, their true feelings come out, and the two ponies find comfort in each other's arms.

When Sweetie Belle decides to try her hand at dress-making, Rarity has a fit. Through various trials and tribulations, the two sisters realize just how special they are to one another. NO CLOP, NO INCEST! This fic is purely sisterly love and focusing on family.

Chapter 1 was inspired by this comic: http://img.ponibooru.org/_images/21a5394cb21de28db316ad33ebb5de2b/37733%20-%20artist%3Amixermike622%20comic%20rarity%20sisters%20sweetielove%20Sweetie_Belle%20tears%20the_bestest_big_sister.png
I thought it was sweet and deserved a more in-depth rewrite.