Our expert says:
This is complex. If you don't tell your girlfriend and her sister does - you look like the bad guy. Your girlfriend will also never know what her sister is capable of (it may be she has done this before, it may be she will do it again). It sounds as if you need to not be in a vulnerable position again because her predatory/abusive behaviour means that she is dangerous in some ways. You will need to explain to your girlfriend why you can't 'crash' at her house again...how else will you do this if you don't tell the truth?
With regards the sister, the ideal approach would be to tell her that what she did was essentially an abuse of you and this is unacceptable. You may be able to work through this to rebuild a friendly relationship; but I advise you to keep her at a distance to make sure that the message is clear to her that you are not interested. My concern is that you might be...you said 'she was all naked and looked very good' - I wonder if you are tempted? All I can say is that this would be a recipe for disaster for all concerned and I strongly encourage you to keep yourself safe from such temptation.
Claire - SASHA
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