@Ridley Wolf  
At first glance, it’s easy to see it that way.
 
I did notice something rather interesting about all of the scenes where Fluttershy is singing for Big Mac. It looks like Big Mac is really, legitimately worried about getting caught not actually performing, himself. Like, he’s hoping no one sees Fluttershy singing…or singing and dancing right outside the schoolhouse window.

Am I the only one that DIDN’T interpret that scene as Big Mac checking out Fluttershy’s butt?

It’s where you transport a parcel from point A to point B, but that’s not important right now.

Cadence: Eeyup now kiss

Tell her how you were checking out her butt, Big Mac.