.. I want to hear you say it!" he ground out at her. "It turns me on... and gives me an extra charge! Oh, God... am I going to give it to you! When yo... get my cock in that cute little cunt of yours... you're going to be begging me to fuck you... fuck you until you can't walk! So start saying it... now!"Charity lay beneath him as if she were paralyzed, her eyes staring in disbelief at her brother's oddly twisted mouth as it spewed out the obscene words. She couldn't understand the change that. Only the thin fabric of his pants was between her hands & him. She could already see & feel his impressive size just by the bulge. She eagerly unfastened his belt buckle & yanked opened his fly. Agent Jada gasped as his remarkable rod sprang free-standing almost straight on its’ own-bouncing & swaying to its’ new freedom. She instinctively grasped her hand tightly around the base of his wonderful manhood & stared in awe, saying, “Oh my god, that’s amazing!”She was stunned at his tremendous size. ”“Wow, Mom. That sounds weird, and kinda funny and ... Well, kind of sexy too.”“Well it didn’t really feel sexy at the time. Nor funny.”“No, I understand, Mom. I’m really sorry.”“It’s OK. But David, there was one time in particular. I really want you to be honest if you remember this.”“OK, I promise I will, Mom.”“One night I woke up in the middle of the night. And my night shirt was hiked up way above my waist. And you were tight up behind me. And you were rubbing ... right in the center of my. His cock was spasming inside me. I came again, as if my body was linked to his, his orgasm becoming mine. It felt like he was pumping pints of cum in to me, we both seemed to be cumming for ages, until I finally collapsed, falling on to the bed, his cock deflating quickly, both of us lying in a pool of bodily fluids.We both lay there silently for several minutes, then for no reason we both began to laugh. I don’t know whether that’s a natural reaction when siblings fuck, but we just did, both.