To: George Weasley in c/o WWW - Hogsmeade Branch
As the envelope opens, the slave coupon previously given to Parvati Patil falls out, magically activated. George is now Parvati's slave for 24 hours.
By now you realize that you are my slave. For your first activity, you are going to get me -
As your next act, you will need to go to the enclosed address and purchase the following robes (I think they'll look stunning on me and they aren't that expensive, surprisingly). The shop owner has my size already. (If you should ever make a comment about my size, I will have to maim you. Actually, I will just order you to never breathe a word about my size to anyone.)
No need to worry about shoes to match as I already have them taken care of. These robes are a necessary part of my outfit for your activites later tonight as my slave.
Be a good slave and send the robes ahead. Then, come to the Room of Requirement tonight. I require your services.
Your Master-for-the-day,
Parvati