While I was pushing into her, my step mother gave out a long slow exhale ending in a low groan. It was kind of a combination of a moan and a grunt, an... the sound set my hips on fire as I began fucking her in earnest. It felt so good, and I had been fantasizing about it so long, that within 2 or 3 minutes I felt myself erupting inside my step mother's hot hole. I left my cock in her cunt to the hilt as I caught my breath, and laid over her back. I was inside her for a long while before my cock. I got both Little David and Coby ready and ran down the stairs, carrying them.“No running in the house!” greeted me when I came into the kitchen.My mom gave me a look. Some things never change. She’d been yelling that at me for as long as I could remember. The boys loved it when I did it, though.Duke was waiting by the back door. He had figured out we were going for our run. Peggy took Little David and got him into his coat so he could go outside while I did the same for Coby. We then went out. I think the trigger for me was when I was confronted by her initial blushing embarrassment, yet her conflicting compulsion to be sexy and flirtatious. Shewould look at him and her nervous throaty giggles were like liquid sex ... like warm water pouring over the head of my penis. I began to experience a heady combination of jealousy and fascination that made my knees get weak and my stomach churn. My penis would swell when I watched her flirt or walk past him with her blouse open.Why did I feel. "I like to make love in my parent's bed. It turns me on. Wait a sec while I pee." When she left I picked up her dark blue panties—one of our school colors. I noticed the letters XS on the tag, and the crotch was wet with white streaks of cum. I put the crotch in my mouth and sucked to taste the juices. Missy walked in while I was licking the cum. I turned red and quickly dropped them.She moved close to me and held me in a hug. She told me not to be ashamed, that she eats her cum off her fingers.