First confession here.
When I was in college, I had a fling with this girl. We had sex a few times, but nothing serious got out of it.
Ten years later, I started dating this woman, and after things got serious, I was introduced to her family. And there she was, a younger sister of my, now wife.
We are married for over ten years now, and she has no idea, that once upon a time, I fucked her sis.