You may well be my stepsister, but you mean more than just that to me. Our bond runs deeper and that’s why you’ll always be my soul sister. Happy birthday.
It’s with great pleasure that I’m wishing you a happy birthday today. You’re excelling in your studies and growing up to be a truly remarkable member of society.
A girl as unique and as wonderful as you deserves the most fabulous and unique birthday too! I’m sending my very best birthday wishes your way today, sweetie!