He had heard muffled screams from his sister's room. He pulled on his boxers and cracked open the door to Lisa's room. Apparently his step-father had ...awaken. He was laying beside Lisa with his legs wrapped around her, fingers pulling aside her panties, and his other hand over her mouth. Even at this moment of Lisa's distress Tony's dick was rapidly hardening. Lisa's eyes found Tony's peering through the doorway. Their gazes met for a second, her's full of pleading and his full of. His voice was a cheery and very feminine alto now instead of his usual tenor. It sounded - familiar. Jack looked at the mirror above a dresser against a nearby wall. He saw Lisa laying on the bed smiling at smiling at another Lisa who was staring into the mirror. Somehow he had become her twin.As he stared at his transformed self in the mirror, Lisa jumped from the bed and ran out of the room. Jack tried to rush after her only to find that she had locked the door. "Lisa, you let me out. By this time the two of you have turned and I see you in profile. You pull his jeans down around his legs, kissing your way down his body as you do. Your tongue darts out to touch the tip of his cock as you get his pants down all the way so he can remove them. Then you open your mouth and take him in. Your eyes are on me as you take as much of him as you can. His head is thrown back and a low moan escapes his lips. “Oh God, yesss!” he hisses through clenched teeth. I know the thought. Your. A few nights later I became aware of my sister beside me. My cock was hard and peeking through my pajamas, as usual. I determined not to stroke myself and Carol stayed for a very long time waiting for me to do so. Suddenly but gently I felt her fingers on my cock. I couldn't believe it. I didn't know anything could feel so good. Her touch was light and yet at just the right spot. Her hand wasn't moving but it didn't need to. I couldn't help myself and came spontaneously. My jism went all over.