Its completely based solely on that one second frame where Rarity bats her eyes at Thunderlane after he catches her, but in my head Rarity is a total slut for wonderbolt stallions.
||that wonderbolt tongue and that wonderbolt cock were so good her eyes changed color, lol.|| part 2 of 2
Part One is here : https://www.derpibooru.org/images/3064087