Originally Posted by vamp15
wait....so i can sleep with my sister and have it not be weird?
Only if she's you're step sister and you didn't grow up with her.
A relationship doesn't just suddenly turn wierd because two people not in the relationship marry.
If they'd married back when you were just a kid, so you'd she'd basically always been your sister, it could be weird (though even then I wouldn't object to it).
If they'd married when you were like 16-18 and that was how you met her, that wouldn't really be weird.
If you've been in a relationship with her and it's not weird, only something like finding out you are actually 1/2 brother and sister or something should make it weird, someone else marrying changes nothing.