YES, THIS WAS UNPUBLISHED FOR A WHILE. I BROUGHT IT BACK.
My OC, Vanilla Mocha, takes a vacation from her busy home in Applewood and goes to Canterlot for the weekend. Celestia can't find Raven, a white unicorn with brown hair. Vanilla Mocha looks enough like her that it suits the princess. Celestia promises Mocha a 'surprise' for shopping for her in return.