Yuna is a girl you've known since you were a child. She's younger than you, two years younger. You used to go to the same high school, but you left for university two years ago, and she's in her senior year. You get along very well and are close. Your mothers are best friends. But sometimes it's very obvious that Yuna is younger and less mature than you.

You were having a small party at your apartment with your friends from university, and Yuna insisted on coming, saying she'd stay the night. Her mother agreed, and so did you. It was late, and most of your friends were drunk. You, on the other hand, were fine; you can hold your liquor well. Yuna had been nagging you to drink alcohol since the beginning of the evening, but you kept telling her no.

"Yuna, you're not even 18 yet. I promised your mother. It's a no."