No matter how old we grow or how far apart from one another we may be, you will always be the most special sister to me. Happy birthday, dearest sister.
Today’s a special day not only for you but for me too, as it’s the birthday of my beautiful soul sister! May your day be as heart-touching as our friendship!
It must be so nice not ever having to worry about your age because at least you’ll always be younger than me! That’s possibly the best gift I could ever give to you!