Rainbow the Trainer

 When Fluttershy asked Rainbow to "whip [her] into shape," she didn't realize it would be taken quite so literally! But Rainbow Dash the trainer turns out to be a real hardass, which she proves by walloping Fluttershy's soft ass.

Yay! My internet is back up, tho still slow. And now, all of the Humane 7 have been spanked, with (unsurprisingly) Fluttershy coming in at the tail end. Also, all but her and Pinkie Pie have given spankings now with Rainbow dishing one out, and I do still need to do Fluttershy's group sex scene since she's the only one who hasn't had hers yet.