This lovely piece was done by the ever-talented Dakuroihoshi https://www.deviantart.com/dakuroihoshi  
, and this particular version colored by myself (as best as I could) as a sort of sequel pic I had in mind to this drawing he did: https://www.deviantart.com/dakuroihoshi/art/Halloween-sketch-3-713965193
 
Following the lovely Royal Sisters’ capture, the all powerful (and un-reformed) Discord isn’t done tormenting the two powerful princesses just yet. He feels just a little more humiliation is in order for their adorable but futile uprising, and thinks one fitting punishment is for the elegant, dignified, and much too serious Princess Celestia to spend a little time in the dog-house instead of her newly chaosified castle. And so it was the custodian of the sun itself is reduced to his newest pet, kept outside in housing more appropriate of the royal pooch, given a nice raw bone to slobber over (whether she wishes it or not) and kept on a VERY short leash until the naughty pup breaks her disobedient habits. As can be seen, Celestia is not entirely agreeable with the new role of being Discord’s literal lap-dog for all her loyal subjects to see, but she’ll have plenty of time to think over her position (and what little she can do about it) while occasionally learning new tricks for her new master. If she’s a good girl, she might even get to play fetch or go out for a walk :) (Smile)