Twilight and Pinkie come across a stallion who's in a pretty bad mood. After explaining he feels lonely, and in need of things to do, he gets to help out the mane six with various tasks in their everyday life.

He grows close enough to them that he gets to join them on their adventures, and he even becomes an honorary Element of Harmony.

A rejection, a change of heart, and some relationship issues later, he marries the pony he had a crush on since they first met, and they live happily together, though, many issues still pop up, both for Equestria, and their relationship.