The incest part in this game makes no sense. I chose the MC to be the brother of Emma because he couldn't be her father being of quite the same age. Apart from the fact that it makes no sense for a sister to "leave" her brother because he fucks her best friend, we then get this dialogue:
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So Sara is Emma's little sister. OK. That means that Sara is also MC's little sister. How the heck did he not have the "opportunity" to meet his little sister? In fact that would be even more strange if Emma was MC's daughter. Then Sara would be also his daughter. And he didn't meet her???
Not to mention that although i chose MC to be Emma's brother, she calls him "DAD":
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Therefore advise for new players: don't set Emma as daughter or sister coz it makes no sense. Just define her as girl friend to not get such stupid dialogues.