As Rainbow moved her legs she upended a table loaded with books and papers. Twilight stared open mouthed. “Uh, whoops? I guess they’re longer again.”  
“Rainbow! Those were all organized!”  
“Okay, okay, Twilight, listen. Don’t worry. I know how to make this up to you.”  
“No, you’re not getting out of it that easily.”  
Rainbow ignored her and quickly sat up, causing Twilight to fall down her chest and in between her breasts as Rainbow pressed them together with her elbows. “Hey, at least it looks like more of you fits in there now too. Maybe soon it’ll even be roomy in there for ya. …So am I off the hook?”
 
A pale hand with purple nail polish shot out of the top of her cleavage giving her a thumbs up.  
-this above written bit was from sizeshifter, who inspired the sketch.