Sunburst is Flurry's foal sitter while Cadence and Shining go out on vacation. While as a foal he and Flurry Heart become seperated and the two go on journey to be reunited.
The second changeling attack on Equestria has helped the Royal Crystaller Sunburst in getting a fresh perspective on several aspects of his life. One particular aspect comes into focus when Shining Armor and Cadance offer him a weekend off.
Starlight and Twilight drink a potion which reveals the downward spiral one of Starlight's alternate universes took. Meanwhile, Twilight watches Starlight take a downward spiral of her own.
After the birth of Cadance's fourth child, an adorable little pegasus filly, Princess Flurry Heart wants to know why none of her other brothers and sisters were born as alicorns. Her parents claim not to know why she's different. They're lying
After the crystalling, the banquets, and the private after-party, Starlight gets her chance to be alone with Sunburst. They realize that they share two things in common: their friendship and different perspectives of the day he got his cutie mark.
Sunburst looks back on his accomplishments, and lack thereof, at Celestia's School for Gifted Unicorns, as he weighs his decision to continue on or not.
Starlight Glimmer, confused about her sudden, rather strong feelings for Sunburst, asks Twilight Sparkle if it is just friendship... or something else.
Starlight Glimmer has returned to the present to find herself a member of the Mane 7. She is now a bearer of an element of harmony, and has a husband—her soulmate, Sunburst. So, what happens the morning after?
Starlight Glimmer destroys Equestria when she learns how she actually lost her soulmate, Sunburst. Fixing her mistake, she learns time travel can lead to a revelation of the heart and the renovation of harmony. (An alt-ending to The Cutie Re-mark.)
After so many years, Starlight Glimmer gets to meet her best friend who's been gone for so long... Sunburst... The two share a moment between each other.