My Top 5 Favourites (In no particular order)

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  Eternal Princess Celestia and Twilight Sparkle's bond is tested by miscommunication and guilt. by device heretic 159,827 words · 3,053 · 65
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  For Her How far does a sister's love extend? How far would one go, to bring the other back? by Pyre 11,517 words · 181 · 8
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  The Flight of the Alicorn Rarity finds herself forced into an unlikely alliance when her airship crashes far from home. by Ponydora Prancypants 227,108 words · 1,437 · 28
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  The Games We Play Somepony is once again masquerading as Mare Do Well, and it's up to Rainbow Dash to figure out who. by AbsoluteAnonymous 137,602 words · 1,987 · 59
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  Boast Busted A sort of reverse of Boast Busters. Read the long description by RainbowDoubleDash 18,355 words · 853 · 48