Was thinking in somebody pranking the Klendathu girls cousins, Dora and Katherine https://www.furaffinity.net/view/30936526/ at same time. Must be somebody big to can do that, so surely is Grisha, or also could be Derek Klendathu. But is more probable to use Grisha on it
Even in the sketch you can easily say that are Klendathu girls with that curves XD

the people is voting in my main page in deviantart to choose the prankster , betweem Grisha, Marcos, Breihzlander or Derek x3

edited: as Marcos is winning very easily, already added his head x3