My dear friend,
You have always been there through the good and the bad. You have held me close and given me so much. I want you to know that you can always count on me. That I will always be there. And that, if you get lonely, I'll catch a plane if I have to to hold you close to me.
Happy 18th birthday. You may be an adult but you will always be a little girl to me.
I love you sister.