Dear Prim,
I'm so proud of you. I really am. You are so amazing and caring and brave. Much braver than I am. I'm sorry I'll never get to see you grow up, I hope you look like Mum, you are so much like her. One day, when you're a healer, they'll bring in someone and you'll be able to save their lives all by your self.
You've grown way to fast and much too well. You're a better person because of what happened last year at the reaping. Please don't think, even for a second, that I ever regret taking your place. I don't. I would have never forgiven myself for watching you go and not saving you, but I did and I'd do it again a thousand times more and never regret it.
Remember when I used to sing to you when you had nightmares? To stop you from crying? Well, I'm not going to stop singing; you just won't be able to hear me anymore so don't cry. I'm sorry they took my away so quickly, I'm sorry I don't have a chance to say goodbye properly. At least this way, you have a piece of me and you can remember my words.
Don't let the world change you. You already carry so many burdens for all the things that aren't your fault, please don't blame yourself for things you can't change. You can't save the world yet, I will die happily knowing that it will make you safer. That it will give you more protection.
If you miss me, cuddly Buttercup. Be glad I didn't drown him. I couldn't do that to you, after you pleaded with me to let you keep it. That annoying fur ball brought you happiness and I can't want any more for you.
Look after Mother, give her cuddles too. You'll know that she loves you even when she can't show it, you are always her baby girl, and my baby sister. My beautiful younger sister who made me a fighter, who made me a much better person. That's why I am doing this, saving Peeta, because I can't be a good person and let him die. Hopefully, you understand that. If not, you will in a few years when you fall in love. A little sisterly advise, fall in love with someone who could never leave you. But has to be pull from you.
They're pulling and pulling and I'm falling. So far down. It's scary but I'll keep strong for you, the only person who could make me laugh when I don't think I can smile. My reason for living.
I promised to always keep you safe, and I'm going too.
I'll miss you.
Tuck in your tail you little duck, Dad would be so proud of you. He always was.
Love you big sister Katniss