Human Rarity gets turned into a dog but because she wasn't used to her new four dog legs she falls into the portal to the pony-side which turned her into a dragon on the other side, where she is found by Spike who gets turned on seeing her new from with her pussy and breasts on full-display for him.
Rarity tries going back though the portal but gets stuck from her dragon body letting just before her hips though into the human-side, the dragon Spike tried to help push her though it but his cock pressed against her ass or pussy and into it while the dog Spike pulled her and his cock went into her mouth both Spikes lost themselves to the pleasure and just kept going until they cummed which made them past out.
After awhile Rarity was able to force her way though the portal where her friends found her with cum dripping out her mouth and Pussy or Ass.
