Catface Icemane has always been a bit of a womaniser, bit of a sex addict. Cast out from his home, he has decided to give Ponyville a visit. After all, while he may not have a home there, he could certainly borrow some from some of the mares - and stallions.
Nazis and ponies. It's a win-win, really.
Humanized Ponyville-wide gangrape of Fluttershy, with female bukkake, featuring Photo Finish and her assistants.