It was still pitch black when I was awaken by someone's lips licking and sucking my cock. At first I though it may be my wife home a day early, but I quickly realized that she was still in LA when I spoke with her on the phone the previous night. I turned the light on and was shocked to see my youngest daughter's best friend Marybeth gobbling my knob. I went to push her away, but she persisted and I relented, allowing her to work her magic lips. She expertly throated my cock taking nearly all 8 inches. I was getting pretty worked up and was about to shoot my load into her mouth when she pulled off and stood up on the bed. She slipped off her tiny panties and straddled me. I had a brief moment of sanity and tried again to stop her. But the sight of her young pussy just inches from my cock proved too much and the feeling of deeply penetrating her tight little snatch sent me over the edge and I almost instantly blew a hot load of cum deep inside her. She giggled and said that always seems to happen the first time with all her friend's fathers. It lessened the guilt I was feeling about having sex with a 15 year old, but I'm still sick to my stomach about it. I never would have contemplated sex with anyone so young, yet it has happened and I am dealing with it. The big question is will I have enough will power to not allow it to ever happen again.