@xMerle was going to ask if they weren't related, thought thIs story mentioned she was adopted but couldn't remember.
I also think you're being pretty unfair saying incest when it's obvious she really likes him. It's the same concept of childhood friends such as myself and my neighbor Alison. We grew up next to each other for over a decade, later I had to move away but found her again in high school.
Long story short, obviously we did it. Terrible ending though because turns out she was my half sister because my father was her father as well. Reason we had to move because it was uncovered.
She's still #1 we just agreed not to have kids.
Fake news. However if this was the truth. I'd have trouble breaking it off just because we found out something like that.
Love is complicated