All I can say is, this is a normal feeling. You're not really brother and sister. I'm not choosing any of your given choices.
You'll just have to see how this plays out. But since she is 18, she's very likely is looking up the age scale to older males, not down to 13 yo males. So happy sexual fantasizing.
Is it normal to wanna fuck my step sister
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All I can say is, this is a normal feeling. You're not really brother and sister. I'm not choosing any of your given choices.
You'll just have to see how this plays out. But since she is 18, she's very likely is looking up the age scale to older males, not down to 13 yo males. So happy sexual fantasizing.