Takes place a few years after the show.
Starlight Glimmer and Sunburst were friends since childhood and have reconnected after they've not seen each other for years. After seeing each other and spending more time together, they've started to develop feelings for each other. Feelings of love. A few years after their eventual marriage, they became parents of two children, Sunny Wish and Crepuscule Night, who have inherited their magical talents and started to go on their own adventures after growing up.
Some parts have Starburst moments, but I will keep the main focus on Sunny and Crepuscule.