Continuing on from https://derpibooru.org/2402875 After having Applejack as her slave Fluttershy felt desperate to return the favour, however Applejack had already had Twilight in this role and wouldn’t chance such a matter again until the rest of her friends each took a turn with a willingly shrunken pony. In the end Fluttershy could only be sure of going through this with Rarity, which led to some interesting shenanigans.
 
Fluttershy was worn out by her duties but Rarity was also feeling tired from the events of the day, and it wasn’t the roughest of tasks she could’ve put to her shrunken friend.