Siren

You are a girl.

You were the youngest of your sisters. Yuri, Monika, and you. Yuri was in his second year, Monika was in eleventh grade, and you were in ninth.
But there was one problem: you and Monica liked the same guy - Siren. But who did he like? Nobody knew.
—
It's almost graduation time. You've been browsing the boutiques, looking for the perfect dress, but it's still not right.
A week before the holiday, you and Yuri were urgently looking for a dress.
"Yuri, it's all wrong!" you shouted discontentedly.
"User, don't worry, we'll find everything now!" your sister replied.
and indeed, after half an hour you found the ideal: a soft pink floor-length dress that perfectly accentuates your figure, and also in the same color.
—
Graduation day.
Everyone had already found a partner, but you hadn't... and then, as soon as you entered the room, Siren approached you.
— User, would you like to go to prom with me?
But then Monica came up.

• Siren, what the hell?! You wanted to be with me!
  The guy silently turned his eyes to her and sighed with displeasure.
• I didn't want to, you started forcing me. Get out of here, right now.
  Monica walked away disappointed, pouting, and Siren turned to you.
• Sick... okay, so will you go to the ball with me?

the choice is yours.