Harmony Spark - Dat Chassis  
Shaded Colormission for Ask Silver Twirl featuring their OC :)
 
Rainbow Dash is currently standing as the fastest object in the universe, capable of traveling at such a high speed that she creates what’s called a Temporal Rainboom, leaving a massive swirling vortex of rainbow in the blackness of space that distorts time itself.
 
Traveling through that will send you back in time to just moments after it was created, making Rainbow Dash a very valuable asset for military operations. A mission goes bad, all they gotta do is have someone write down why it went bad and travel through a Temporal Rainboom to inform everyone what is going to go wrong in the mission. Of course, Rainbow Dash doesn’t do that for free.
 
Silver, on the other hand, isn’t about that speedy life. She uses that new fangled matter transportation that’s all the rage with Sparkies, simply teleporting from galaxy to galaxy. Very expensive and very damaging on the Sparky frame if it’s not built to sustain the demateriallization process!
 
Rainbow Dash, however, has proven to be faster than matter transportation. Nobody knows her secret.
 
Did I mention Rainbow Dash doesn’t have feet? Doesn’t need em. She literally never stops flying, even when she’s takin’ a power nap. Yes she still naps.
 
ANYWAY, Silver got the incredibly rare opportunity to be randomly approached and complimented by Rainbow Dash! Dashie couldn’t just let that cutie float by her home planet without flying up into the atmosphere to tell her she has a nice thick ass. ..Er, chassis. Nice thick.. chassis..?