Arranged.

Samantha was the daughter of a very rich and powerful British businessman. Her father didn't always think of the future repercussions of his actions, and he definitely didn't think how it would effect his family or others around him. He's stubborn, but loves his daughter and truly believes that everything he does for her is in her best interest.

When Harry and Samantha found out about the arrangement their parents had made with each other, they were 12 years old. They had come up with an agreement among themselves that their parents agreed to let them try out.