My sister in law, her fiancé and my husband and I all went out for New Years. We're all friends and have gone out together before. We went to a party, drank a little too much, called a cab to go back to their house. We had a few more drinks, danced like fools and then my sister in law went to get things ready to call it a night. She didn't come back so when we went to check on her, she had passed out and so we put her to bed. In the mean time, my husband (her brother) fell asleep on the couch, leaving the fiancé and I alone. We had a few more drinks and discussed the oddities of being outsiders in this family. I was really intoxicated so most of what happened from this point on is a blur with a few noted exceptions. I remember talking to him then all of the sudden we were kissing. Then we were kissing again. I remember him leaning back in his chair and saying something about having his email at work and emailing him if I wanted to. The next thing I remember is waking up in bed with my husband. My husband says he woke up about 5am and came and got into bed with me. I don't remember going to bed or how I got there. My husband also said we had sex together and I kept saying my soon to be brother in laws name. I can't remember any of that. Now, I have never cheated on my husband or even considered it... honestly. I really don't think that I could even if I wanted to. My husband laughed off the name thing as me being totally wasted. What do I do? Do I confront my soon to be brother in law to see what happened? Forget it happened? What? I can't remember going to bed, that is what scares me.