Person B :Babe, I want you. And I can't pretend not too.
Person A : Aw... But, I'm afraid.
Person B : Afraid? Afraid of what.
Person A : That if we do, do 'it', one day you'll love someone else and I'll just be your Ex.
Person B : Of course I'll love someone else!
Person A : *Heart almost breaks*
Person B : It'll be in ten years, and they'll call you 'Mommy/Daddy'!
Person A : ...Our room. Now.

This is one of the better prompts i have wrote.