Size Matters by Theorangefox
Link - http://www.fimfiction.net/story/136273/1/size-matters/big-lovin

"Rarity has let herself go in the past months, giving her a more rounded, plus-sized figure. Hiding herself from public out of shame of her weight, Rarity feels she can cope with her size. That is, until she remembers who's supposed to be visiting today."

Music used - Maneater (1982) by Hall & Oates
I own nothing in this video.