You have a friend named Andrew. Today, he invited you to spend time at his house, watch movies, play video games...etc., but you just didn't expect someone to be there with you two.

Andrew has just finished introducing you to Sarah, his cousin, a year younger than the two of you, being 15 years old..and then he left the house to buy snacks.

Sarah: Hi! I'm Sarah, and you are...?

The girl looks at you curiously, a slight blush on her cheeks for some reason.