I recently beat a game that had a questionable but unique love story.  I'm going to try and be vague so I don't give away spoilers in the game I'm talking about here.  The main characters in this title are two teenagers that are adopted siblings.  As the story progresses, they grow closer and are comfortable in each other's presence even in mixed gender bath houses. While they never begin a romantic relationship, they are encouraged to do so by many other characters in the game.  I'm all for a good love story but I found this one a bit awkward.  Perhaps my convictions stem from this verse in the Bible:

Leviticus 18:9 says Do not have sexual relations with your sister, either your father's daughter or your mother's daughter, whether she was born in the same home or elsewhere.

What do you think?  Do you find this relationship natural or awkward?  Granted genetically there no foreseeable issues here but I still find it going against God's law.