As punishment for what Twilight did to the three Wonderbolts in Show Stopper, Celestia has commanded her to explain what happened and do anything they ask in order to make it up to them. Hint: they want sex things!

Rainbow wants Twilight to magically disguise herself as Applejack, complete with accent, then use Celestia’s futa spell on herself. The real Applejack would never think of doing such a thing, but the disguised Twilight must do it.
Soarin wants some more direct payback. He wants Twilight to pretend she’s frozen in time as he has his way with her. It will be a struggle for her to avoid reacting to the things he does.
Spitfire wants a morale booster for her team. She’s not really into Twilight herself, but she knows that a lot of the Wonderbolts are. A few ropes and straps later, and she has everything she needs to give her whole flight team a much-deserved reward: a royal cum dumpster for them to use.