Twilight needs help researching flight dynamics to improve her wing-granting spell. She seeks out Rainbow Dash's help. Dash has other reasons for helping Twilight...
If you're a Twidash fan, thanks for giving this old thing a read. When I wrote it, I did ship Twidash myself. Alas, no longer. I will not be writing a follow up, I will not write another Twidash story unrelated to this one. Between some kind of artistic integrity and a desire not to remove a story no matter how little I care for it, this story will stay here.