When she had licked all the juices up, she started moving her mouth up and down my shaft again, stroking my cock as she took as much as she could fit into her mouth. This time I noticed that she had one hand on my dick, and the other hand was on her black internal creampie mound as she diddled her clit in time with her movements on my dick.
She took her mouth off my dick, and once again moved up to mount me. She started playing with my nipples, stroking them, then pinching and pulling them. I started to do the same with her breasts, stroking them, then pulling and pinching her nipples. Each time I pinched her nipples I could feel her black internal creampie pussy contract around my shaft. She started rocking her hips, faster and faster. I could feel an orgasm building up in me and I moaned at the pleasure I felt. As I was nearing my peak she once again slid off me and took my rock hard dick into her mouth. This time there was no stopping it, and I felt my dick swell as an orgasm took hold of me. My balls boiled over, sperm racing up my shaft into her mouth. I felt her hold still, one hand a blur on her clit, the other supporting her kneeling over me.
As my orgasm died down, I started to become aware of my surroundings, and noticed a movement in the corner. There in the chair sat my wife, naked, one hand pulling hard on her nipples, the other hand buried in her snatch moving rapidly, her eyes wild with lust. My sister pulled off my dick with her mouth closed, got up from the bed and moved over to my wife. My sister looked at me, and opened her mouth. I could see my come pooling in her mouth, her lips glistening with my black internal creampie. She closed her mouth, then suddenly turned around and mashed her lips against my wife's lips, forcing them open as they shared a deep, passionate kiss full of my come. My wife started moaning and writhing in the chair, her hands a blur on her black internal creampie pussy and nipples. She went rigid as her orgasm took her, every muscle in her body strumming with sexual energy. As they broke from the kiss, my wife went limp in the chair, panting at her exertion.
"That was a black internal creampie", my sister said. "You like?" "Wow", my wife said. "Ditto" I said, and then paused for a moment. "What's lesson number two?"