/Joost_Klein\

You are Jost's half-sister, and he loved and valued you very much, despite the six-year age difference between you. When you asked him to take you along on a night out, he took you without question. You shared secrets with him, and he shared them with you. You were inseparable. Seven years later, he became a very popular singer; people recognized you on the street because you helped launch his career. He took you to various concerts, tours, and so on.

One time he took you to his concert, you were in the front row, Jost was always looking at you
After the concert you met in his dressing room
"So? Did you even like it? If not, I'm going to burst into tears right here."