It was my graduation day from high school, my mom and dad, and two brothers made the trip from Virginia to come to my graduation. We had a small party/open house the same day, family and friends came and had some of the food and talked and everything normal that goes on at one. Later that night my grandmother went to get cigarettes for my mom and herself, my brothers, dad, and grandad were all asleep. I was 18 and had had one girlfriend in school that let me look at her boobs but that was it, I was so excited by my own mom sitting there talking to me, I couldn't take my eyes off of her breasts. I just got brazen and with my penis sticking out like a flag pole asked my mom if I could see hers for my graduation present. She started freaking out and giving me the whole conversation about how its wrong and immoral and etc. I was like hey I know you are alone because dad hasn't slept in the same bed as you in years, its O.K. and I started to move my hand to my moms vagina. She grabbed my hand and said O.K. but just my boobs and you cant touch. So she whips out these huge boobs and I lean in and lick her nipple she said I said no touching I replied I didn't. Then I started rubbing her vagina and she started to complain so I kissed her neck and yanked her pants and panties down just enough where I could see her slit start and crammed my finger inside her vagina. She gasped and when she did that I jumped straight down and licked her clit, she pulled me up by my hair and said no, that's enough plus your brothers might come looking for me. At the same time I hear my grandmothers car pull into the driveway and I straightened up and went upstairs jacked off into a pair of my moms panties out of her suitcase and put them back. I later found out that my mom and dad had sex that night for the first time in years.