from the source:  
@burst-fire and I got in a super violent heated chair-throwing death-threat filled argument and settled it by agreeing to do a collaboration involving big titty Rainbow Dash.
 
Remember all arguments can be settled with big titty Rainbow Dash.
 
As for the subject matter here, Rainbow Dash went to Rarity’s place for some teacakes and to try on a new dress.
 
After the teacakes, while undressing, she noticed her ass seemed to have grown. Quite a fucking lot! Her poor half-back panties were a thong in seconds.
 
Rarity was looking through Zecora’s exotic baking seasonings and found “Ghetto Booty” powder, and figured it must be some kind of fancy powdered sugar.
 
Considering Rarity had 2 more teacakes than Dashie, she’s gonna have a rude awakening while out on the floor at the boutique.
 
Her tight little skirt’s gonna be shredded.