In the source the artist said they aren’t a fan of this pairing, and just drew it for the heck of it.  
So let’s not start any “Sonic drama.”
 
I know I’ll take heat for this, (seeing as how both bronies & Sonic fans alike loathe this pairing) but this one’s actually not bad, and a li’l better then other “SonicDash” pics, considering they’re both human here.  
(I know they’re both animals, but seeing a more anthropomorphic hedgehog smooch a quadruped pony looks weird… It’d be better if they were both drawn anthro’, or human.)
 
Also, believe it, or not that actually is Sonic’s official humanized design by Sega artist Yuji Uekawa.  
I don’t care what anyone says, as I like the human Sonic design personally. Especially, the crazy outfit.