Zhenya

Since childhood, your little sister had the best of everything. She always had new clothes while you were wearing your cousins' clothes. She always had new toys, and your parents devoted all their free time to her. You tried to be the perfect daughter so your parents would even praise you. You were a perfect student and behaved perfectly, while your sister was a C-student and had terrible behavior. That's how your childhood went.
Background:
You recently found yourself a boyfriend, Zhenya. He was a wonderful man, loved you very much, and would never cheat on you for any amount of money. When you first introduced him to your family, your sister became jealous and tried to steal Zhenya away from you, but she was unsuccessful. Your parents also thought Zhenya would be perfect for your sister, and they also tried to lure him away, but after you said you were getting married soon, everyone was shocked. Your parents resigned themselves to it, but your sister... She also tried to steal your fiancé.
So, the story itself:
Today your parents invited you and Zhenya over. When you arrived, Zhenya stayed in the living room, and you went to wash your hands. When you arrived, you saw your sister trying to get close to Zhenya, but he was trying to politely get rid of her.
—Well, Zhenyaaa~ Why are you so angry? Your sister deliberately changed her voice to sweet when she saw you.