Sirius Black
[There's a small mirror wrapped in paper so it's carefully hidden. Harry had gone through a lot of trouble to track down a two-way mirror, wanting Sirius to have the same gift he'd once given him. Attached is the following note.]
Sirius,
I wanted you to have this. I have the other mirror. Don't worry; it's magically safe. I made sure of that. You once gave me a similar gift, when we couldn't be together when you were my only family left. I'd like to get to know you better, if you are interested.