Her cervix was convulsing around the head of my cock so strong it felt like it was a mouth sucking my cum out! I feel my balls tighten. My cock grew ...ven thicker inside of her and started spasming. She must have felt this too, because her eyes grew wide with a look of panic and fear of what she knew was coming. At that moment she remembered that she hasn‘t been on birth control! She started to sob “no, no, please no” even as her uterus was convulsing and her cervix was clamping down on the. . some things were so very hard to say, even between mother and daughter."Debby," she began, "I... I want you to know that I saw what happened in your bedroom last night, between you and your brother."She hadn't even finished the sentence before the blood began draining from the girl's face. Debby had trouble finding her voice for a moment."You... you... what?"Mavis nodded, still trying to keep things casual and relaxed. "You heard me, Debby," she said. "I guess you and Billy just didn't. Strangely, I wasn't feeling any guilt. I promised myself that this was a one time thing for at least the next 2.5 years, and only hoped I hid it well enough.On Saturday night, when Mark made love to me (after doing it both in the morning and in the afternoon) in his wonderful way, I felt that I really pulled it off and he had not even suspected. Perhaps because I felt so good I missed his meaning when he suddenly said:"I'm so glad that our marriage is holding strong as it is. I know my. You trembled as you realized I had brought others back with me and in a few seconds they were going to see you spread out on the table in that position. You were nauseous and thought you would throw up as the voices grew closer.When we turned the corner at the bottom of the stairs, they were stunned. They stood there unsure what to do or say. I saw your eyes were clinched shut as if that would make everything go away.I walked to the end of the table and stuck my fingers into your cunt, covering.