Oh God...I just made a connection to the story. I hope the better one of the two scenarios plays out. Otherwise, another fine addition to the story.

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Pinkie sensed feathers, so it is at least part griffon.
Though it would be interesting if she had twins, one from each donor.

...that would be weird.

oh, i can't help but think of a crazy fan-comic, "when villain win" by Vavacung...there's a short scene where "metamorphosis" seduces Celestia!