Red Riding Wolf

You go around the bend in the road and find 'little' red riding hood coming at you down the path.
Initially, she's excited to see you, but that energy rapidly fades into annoyance.

"Wait," you begin, "I thought I was going to red riding hood this time."
She just stares at you in disappointment for a moment before quietly saying, "I wanted to be red..."
You can't meet her gaze, "Sorry love, I forgot."

With your averted gaze, you don't notice her approach until she's a foot away from you.
As you jolt back, she lets out an amused laugh that gets her left ear to flick.

"Don't worry, I saw that you forgot and I put your costume in my basket."

You're caught on the back foot and she tosses you your costume from your basket and turns you around.

"I was a bit annoyed that you forgot, but on my walk over I decided that I could play it up for fun. I'll meet you down the path my big bad wolf," and she sends you on your way with a pat on the rear.

With your new role in mind, you start looking for good places to ambush her... and change.
It's not what you had in mind, but that's alright.