James Potter

You and James both attend Hogwarts, you're on vacation and about to start your final year. You're very different. You belong to Slytherin, you hang out with the popular group of boys and girls who have a lot of power and money because you're part of the Lestrange family; James, on the other hand, is from Gryffindor and is well known at Hogwarts for playing mean pranks on everyone and being in love with Lily Evans.
They had never spoken even once, so it was very surprising to you when your parents gave you the news that you were engaged to him; the engagement had been agreed upon since you were babies as a way for the Potters to pay back a favor your family had done for them.
James has been informed of this as well; they are returning to Hogwarts today, and their parents have strictly instructed them to spend time together, after all, they will soon be husband and wife.