Starlight makes a batch of love potion and Sunburst accidentally drinks it, but he seems unaffected, did she mess it up or could it mean something else?
When Starlight Glimmer reads A Hearth's Warming Tail for herself the day after Hearth's Warming, she finds it to be a bit different then how she remembered. Specifically, what was Sunburst doing in the story?
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.)
(Prequel to "Birthday Built For Two".) On a trip to the Crystal Empire, Starlight finds Sunburst acting rather strange. Before she has a chance to ask him though, she gets roped into helping him foalsit Flurry Heart for a day.
(Sequel to "Starlight and Sunburst's Misadventures in Flurry Sitting". Takes place after "A Horse Shoe-In".) Trixie takes it upon herself to set up a date for Starlight and Sunburst, since the two haven't had one in a very long time.