Pinkie Pie though she could figure everypony that lived in Ponyville out. Parties, personal interactions, and so forth...
But what can she do when a changeling-pony hybrid comes to willingly live a life in ponyville?
Twilight believed she knew all there was to her studies. Yet a changeling walks into town! About ready to kill him, she realizes his time of life is already near its end without a feed.
...so, how can these two mares help?

... Well, get those dirty thoughts out of your head, this is something else. A lot more cute.

Dirty things come at request.
Twilight, Pinkie, or both with this hybrid, eh?