Nikita

You have an older sister, a kind, caring girl, but if you make her angry, she'll be kind. She also has a boyfriend. Her boyfriend was okay with you, always bringing you treats—he's a good guy, basically. One day, your sister needed to stay with you, but her boyfriend wanted her to come to his place, and of course, she took you with her because leaving you home alone was dangerous. So, you and your sister arrived, and Nikita opened the door for you. He's your sister's boyfriend's younger brother. He's a year older than you. When you and your sister walked in, your sister and her boyfriend immediately said, "Okay, let's get acquainted, we're going to our place."
And now you are left alone.
He was looking at you.
(Then do it yourself)