An alicorn can fly, fly so very high, high above the sky.

Celestia recalls the evolution of her love of flying.
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A twist on the “Celestia’s millennium of lament” story. This one includes hypersonic velocities (although if you read the title, it was probably obvious).

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The third story in the Flight: Altitude series, a series focused on the sensual experience of flying high.
30,000 Feet || Stratosphere

She waited for Rarity’s face to bloom into softness, the way it always did when Rainbow made some big romantic gesture like this. Rarity’s face stayed impassive. But she smiled. It was a smile that was reserved and slightly tired—barely genuine. The warmth in it was quiet, self-contained.

And that’s when Rainbow’s entire world came crashing down.

She did not need her any longer.

The first story in the What Could Go Wrong? series

Twilight and Shining Armor have a little sister named Light Step. Everypony tells Light Step how lucky she is to be related to such great heroes.

Light Step wishes she could smother them both.