This situation with my sister in law has been ongoing for decades at this point. It started early on as flirty banter when I first started dating my now wife. I don't know if that flirting was just to test me or genuine interest in me which was awkward since I was dating her sister.

As the years went on and things got more serious, her behavior got worse. This included nudity and inappropriate offers that would get dismissed as "that's just how she is".

Well this weekend my SIL crossed a line that I honestly didn't think she ever would. We were away on a little weekend getaway renting an awesome house on a lake. We all were having a great time, drinking, cooking out, just a very chill weekend. Throughout the day her behavior was pretty much in check although she was drinking more than most and there were occasional inappropriate comments here and there about my dick and the things she would do.

I sleep on the couch and have for several years due to my snoring keeping my wife awake. This was no different and everyone settled in for the night. At some point in the middle of the night I start having a sex dream (not really sure how much was dream or my mind just letting me know something was actually happening). I wake up to my SIL playing around while I was asleep. I don't think it was going on very long because I imagine anyone would wake up pretty quick from that, so must have been basically only a few seconds or so.

I halted everything and left the room until she went back to her own room. I am at a loss for what to do now. I don't think this is one I can tell my wife about.