You simply don't. If she is indeed attracted to you then you tell her to abandon this stupid idea because you know very well that it is not correct and that she should not have any illusions.
The fact that you even ask this question leads me to believe that you would not mind fornicating with her and that is simply something to avoid because of co-sanguinity.
Get this idea out of your mind and if she is indeed interested in you, you better tell her to forget about anything happening between you.
You also don't tell us whether she is a child or not (less than 18 years of age). In this case you have one more reason to take your distance from her.
Most Helpful Opinions
You don't. If she is, she will probably say something eventually.
What Girls Said
It is best to just leave this one alone.
Why don't u talk to her straight
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