A beautiful flute being played. Looking out at the clearing, you see what appeared to be many other people following the melody in a trance, but it was clear that wasn't the only thing magical about the situation.
You manage to spot Sarah among the people dotting the area naked, though it was hard to say so as her body was covered with fur matching her hair color, save for her hands and feet which now appeared as a mix between human hands and feet, and a rodent's paws, which she held her pawhands up to her chest limply. Trailing behind her was a smooth, furless pink tail that had just finished growing out to full length.
Her head had changed as well, with her ears much rounder and larger, poking out from the top of her hair. Her face was pushed out into a half muzzle with a small pink nose at the end and large whiskers poking out of her upper lip. Her front two teeth were also considerably larger, clearly shown as she lightly bit the bottom of her lip with them, quietly squeaking. It was clear she now resembled an anthro mouse person.
You scanned the area to see that the others were from town as well, all in trances and all mouse-like in appearance as well; hair colored fur, bucked teeth, and paw-like hands and feet. You were even shocked to see Rusty and Christine slowly walking towards the music, clothes being discarded and divots for whiskers already forming on their stretching faces.
That's when you're drawn to the source: An anthro mouse with a small crown and cape playing an old flute on top of a small hill in the center of the clearing. It was obvious that he was the one causing this! Now you just had to get closer and listen to that beautiful music...
Unbeknownst to you, your assessment of the situation caused you to be distracted from the music, unaware that it began to subconsciously seep into your mind. Had you fallen under its spell already?