Sunset's friends ask her for help with a lot of things. Pretending to be Rarity's boyfriend at her cousin's wedding is a new one. It can't be that hard, right? A sharp suit, some expertly applied makeup, and a good backstory and she'll be charming the pants off of the bridesmaids in no time.
But just what is Rarity hoping to get out of this subterfuge in the first place?