Of Biceps and Butterflies was pretty much inspired by the episode "Rainbow Falls" and the interaction between Bulk Biceps and Fluttershy. It started off as a " What do you think Rarity and Twilight Are talking about when Bulk is Flexing to Fluttershy and evolved into a cutesy romance about two ponies who have their own insecurities, learning to overcome them with the help(?) of their close friends.
So sit back and enjoy this feel good romance.