O-okay, I can do this... *ahem*
*strikes uncertain pose*
The n-name's Rainbow Dash, fastest fl-
No, not confident enough...
*puts hoof on chest, striking a cocky grin*
Gosh, I look so weird doing that...
Maybe I just need to-
*starts walking in circles with her chest jutting out*
Walk like Rainbow Dash. Talk like Rainbow Dash. Think like Rainbow Dash.
*ahem* Scratchier voice. Make it about... 20% cooler. Yeah, like that. That's right, I'm the fastest flyer in Equestria and I've got to act the part!
You got it, Fluttershy. Nopony will even be able to tell the difference!
*awkwardly poses in mirror again, before immediately turning red and putting her hooves on her head*
N-no, I c-can't, I just have to-
*desperately grabs for mask, stretching it tight and fumbling it over her face before fitting it with a loud snap*
*poses one more time, this time perfectly, down to the determined eyes and self-assured grin*
Don't you worry, Fluttershy. Rainbow Dash is here and ready to be awesome!
(in her head) Eek! I can't believe I just did that!

===

Commission I received from  JennieOo, please go check out the original here: https://www.furaffinity.net/view/56420898/
Pt 2: https://www.furaffinity.net/view/64793055/

If you'd like to see more fics and pics like this, join my pony suiting server and say hi! https://discord dot gg/cwftjXNxjS (18+)