My stomach was starting to hurt and I could feel tears building up in my eyes. But even then, I couldn't change the fact that Isabelle's actions felt good. My body's reaction was all the proof she needed. She bobbed her head up and down sucking me in and out of her as she breathed heavily. She was moaning with lust. I felt tears falling down my face as I let my head drop back. 'How will I ever face my sister again?'
I gripped the sides of the chair and tried to force my hips still. Again, I didn't succeed. My hips started involuntarily thrusting upward, meeting Isabelle's downward stroke. She reacted with more intensity and lust. It didn't take many more reps before I felt my inner being stir. My body was about to release its seed.
"I'm cuming. Please stop. I'm cuming." I didn't win that plea either.
The last thing I wanted to do was leave the taste of my cum in Isabelle's mouth. Ashley would surely know something happened. I reached down and forced my shaft from her and pointed it at my stomach. I started jerking it violently trying to relieve the building pressure. Ropes of cum launched across my stomach and chest.
"You like to pleasure you self?" her eyes were full of lust. She leaned back off her knees and braced herself with one hand. She pulled her dress up her legs, above her knees and thighs, then I saw it. I was looking at my sisters uncovered privates. Her cunny was covered by short neatly trimmed pubic hair. Her legs wide open and bent at the knee. Her feet flat on the floor. She was biting on her finger.
"You go for me, I go for you, Mr. Du Bois." Her hand traveled from her lips to her center. She started rubbing her labia up and down with the palm side of her fingers. Her head fell back as she exhaled a deep moan. She circled harder against her vagina and I could see her pushing a couple fingers inside. Her hips bucked up and down. The faster she moved the louder her moans became. She was circling her clit violently. Rubbing it back and forth as her pelvis rose and fell repeatedly. She stopped suddenly. A long constant moan was building within her as if trying to escape. It almost sounded like a cry of surrender as her body started convulsing. Sweat was pouring down her face and soaked in her hair.
She let her hand give way so she could lay on the floor. Her chest was rising and falling fast as she was trying to catch her breath. I was frozen in place. I didn't move while all this happened. I didn't turn my eyes, try to run or ask her to stop. I just sat there and watched.
As Isabelle's breathing started to calm down I noticed her eyes were closed. I didn't want her to fall asleep like that so I picked her up and put her in the bed. She held my neck tight and tried to pull me in bed with her. She didn't put up much of a fight and surrendered by kissing me again before rolling over on her stomach to rest.
I went downstairs and cleaned myself off. I was like a zombie. I kept replaying what had happened in my mind and was trying to prepare myself for the consequences. I felt sick. I locked my door and laid in the bed. I could not face her after what I just let happen. Why didn't I see it? Why did I lie and not tell her about Isabelle trying to kill herself; or that her and Mr. Du Bois were having an affair. If she had known she probably would have never agreed to this. I felt the contents of my stomach trying to surface. I ran to the restroom just in time to unload what little food I had in me.
I couldn't sleep. I watched the minutes tick off the clock. Every now and then I'd have to wipe a tear from my eyes. I heard Ashley moving around. She called downstairs for me. A minute later she knocked on my door and called for me again. I didn't answer.