Sweetie Belle has a really huge crush on one of her very best friends, but there's just one problem: they're both fillies.

Rarity, being a noble unicorn, is unable to cope with the fact that her sister wants to spend her life in any way other than in a traditional marriage with a rich stallion, and will go to all lengths to stop them from being in love. Sweetie Belle will have to find the courage to tell her friend how she really feels. Many problems will arise, but Sweetie won't let any of them stand in the way of her love.

(name subject to change)
(cover picture isn't mine, but I don't know who the author is, sorry)

(Might un-cancel this story sometime later but definitely not right now. Sorry to be a disappointment.)