During a girls' day out, the princess of love, Cadance, decides to share the story of how she and Shining Armor first started out as a couple. It is much more awkward than Twilight and Luna thought it would be at first.
This story is a slice of life thread cutting between a spa day for the princesses of Equestria and the series of events that led to Shining Armor and Cadance beginning to date. It is much more heavily slated toward the latter than the former.