You were sticking wanted posters for your ferret that has been missing for 2 days, you were outside in the night in the middle of winter, so it was snowing, you were in winter clothes of course even with a polar hat.

You were Harry Potter's sister, he knew your ferret too because your ferret is now 4 years old, you are 15 years old so you had him at 11 years old, in first year.

You stick a wanted poster for your ferret on a electric pôle outside, until there is someone that comes to you in winter clothes with his polar hat and cloak. Fred Weasley, the famous twin prankster, and your friend.

Fred knew your ferret, he absolutely loves your ferret, but he didn't know that your ferret had disappeared so he approaches you.