Derpy Hooves has been a silent fan of Rainbow Dash for a long time. Circumstances lead to her secret coming out.
My first attempt at a one-shot. I might add more Dash/Derpy shenanigans sometime.
EDIT: I am aware I missed a huge, HUGE plot hole concerning a certain scene. Thank you for everybody who pointed it out. It really furthers me as a writer, and I'll be sure that next time, I'll analyze plot more carefully.