Dear Miss Weasley,
Thank you for the very kind letter. Most of the letters I get these days are notices from Gringotts saying that I should get a new vault soon, since all of the gold in there is spilling out. Only joking!
I always knew that your parents and your aunt and uncle were never fond of me. Back then, Slytherins and Gryffindors never mixed, no matter the circumstances. Except for maybe the Battle of Hogwarts, but even then, there were only a few that fought for the good side. Did I fight for the good side? No. I was too busy trying not to get killed that I didn't cast a single hex.
Anyways, I never liked them either, to tell you the truth, but as the years went on, I realized that I had almost no reason to hate them. Your father was just there, your mother was just a bit annoying until we turned about thirteen, but I'm sure your father has said that, and your uncle never did anything to me. In fact, any time they got violent at me was because I provoked the attack, such as calling your mother a mudblood. (I do regret that.)
The things I did as a teenager has come back to haunt me. I wake up every morning, and what do I see? That ghastly tattoo. It's cursed on there, unlike Muggle tattoos, which remove relatively easily compared to this.
But in fact, keeping that tattoo on my arm is a good reminder of how far I've come, and how far I need to go to set everything right, and how to raise Scorpius. Looking back on my childhood, I can see that my father was not fit for parenthood. He would get me anything I asked for, and raised me to be a cruel man, only caring about power.
If I had never gone to Hogwarts, never gotten myself into this whole Death Eater mess, and especially never met your uncle and mother, I probably would be dead by Voldemort, in Azkaban, or like my father.
So in fact, it was never me that saved your uncle's life, it was your uncle who saved mine.
Sincerely,
Mr. Draco Malfoy
P.S. Please don't tell Harry I said any of this.