You immediately twist around to grab what looks like a brown horse tail hanging out of a whole in your pants. You're shocked to feel a long thin appendage amongst all of that hair: an actual horse's tail. You yank it on impulse, and yelp as a shot of pain races up from it. "How did she do this to me?" you wonder, remembering the witch from the road.
You let go of your new body part, watching it in the mirror even as it still sways slightly behind you. You close your eyes, but you can still feel its pendulum-like tug on your spine. Your heart sinks as the reality of your situation sinks in.
"I've got a fucking tail," you say to know one in particular.
You look back at it again, disgusted to have this appendage from a barnyard animal hanging from your behind. Still, you can't resist trying it out, and in seconds you can move it around just like a horse can: flop it up and down, swish it from side to side, even swing it around in a circle. You start to wonder if the transformation is over, or if you should worry about becoming a full horse.
Then the pain jolts through your stomach again...