What if you got the less hot sibling?

Like let's say you just started dating this girl and when you met her family you see that her sister is crazy hot. Your girl is short with no boobs or ass and an average face but her sister is average girl height with big boobs, nice ass, and gorgeous features. If you like the girl is this something that's going to affect you? Would you be thinking about the hotter sister all the time? If you're the less hot sister should you have reason to worry about introducing boyfriends to your sister?
What if you got the less hot sibling?
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