Twilight has lived to adulthood. It coincided with alicornization, but she still feels a empty spot where a lover would reside. The duties and hardships of even her meager rule just highlighted this gap before her concious mind.

Thus, after a long hard search in the crystal tundra for Sombra's corpse, she is delighted to discover a suitor procured by a Celestia herself. Somepony entirely new to discover.

This is of course, not Twilight's tale. This is the story of poor poor Alex, and the hardships a solar princess inflicted upon him.
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