Feel guilty but I didn't do anything
Last week my son and his friends were sleeping over. They were in the den watching "Return of the Jedi" and I overheard one of them remark that I would look good in Princess Leia's slave-girl outfit and another called me a "milf" and my son agreed. I was flattered and embarrassed.
Later that night I dreamed of being a slave-girl with my son and his friends using me. I woke up very aroused and masturbated. Afterwards I felt guilty. I went to the bathroom to clean up and I heard these noises. I peeked in and I could tell that the boys were having s**. I watched for a while until they changed positions, then I dashed back to my bedroom and masturbated again.
Now I fantasize constantly about my son and his friends, sometimes just them, sometimes with me. I saw my son put a jar of vaseline in his backpack before going to school, and I couldn't help getting aroused!