Swapping step daughters at prom night

I don't know what you said to those guys, but whatever you did ruined our fantasy night totally and completely.

Yeah, we only get one night of this. You think it was easy doing all our hair and makeup? We spent hours getting ready.

Prom only happens once.

We just wanted to lose our virginities tonight. Prom is a once in a lifetime opportunity.

And you ruined it.