I would like to thank Chasp for editing this story for me.
All characters are fictional and 18 years or older.
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As I awoke the next morning, my mind traveled back to the previous night, and all that had unfolded. I couldn't help but wonder how Sis was going to react after she caught mom and I, and what would she do now that she knew all that had transpired in her absence. However, I also was interested in Dad and how he set me and mom up from the beginning. I was determined to set my full concentration on figuring out what my father's hidden agenda might be.
Was it because Sis wouldn't approve of mom and me, and that perchance she would feel some sympathy for him by seeing us together? Or was it possibly to get Sis used to the idea of having sex with another family member?
I thought long and hard on the subject, but in the mist of all my thinking, my psyche got stuck on seeing Dad and Sis together again. And as before I pictured them both entangled in each other's arms. I watched as Sis slowly worked her hand inside Dad's pants and freed his hardened dick and said "I'm here for you, Daddy. Princess is going to make it all better." Her fingers tickled his balls and made him grunt in joy.
As their forbidden romp unfolded in my mind, I found my own hand inching closer to my stiffening pole. I closed my eyes and decided to just enjoy my imaginary journey into this twisted fantasy that was exciting me so much.
My hand stroked on my dick as Sis eased herself close to Dad's throbbing penis and slipped it deep inside her mouth.
"Ohh... Fuck," I said out loud as the image brought me closer to my own release. My hand went faster as I watched Sis increase her bobbing on Dad's cock, his noisy grunts echoing in my mind.
But I quickly stopped as I felt the touch of a strange hand grasp around my excited dick and snap me out of my perverted fantasy.
"Rebecca!"
"Shhh... you'll wake everyone," she said as her fingers lightly stroked up and down my shaft.
"Ohh... Ohh... shit," I whimpered as her face inched closer to my protruding tool.
"I've thought about your cock all night," she said as her sweet wet lips kissed and slipped over my stiff pole.
I closed my eyes and relished the feeling she was sending throughout my entire body, as her tempo increased along with my pleasure. I opened my eyes and watched intently as she skillfully sucked away on me, and I thought about how much she resembled my Sis.
It didn't take long before my imagination ran wild and I pictured Sis slurping hungrily on my meat, and my cock stiffened more as my deranged thoughts pushed me over the edge.
I became so excited by my fantasy my hand quickly gripped tightly to my imaginary lover's bobbing head and pushed her down harder on me as my hips thrust up sending my entire cock down her silky throat.
"Oh... Fuck... Sis!!!" I moaned before I realized what I'd said.
Rebecca quickly stopped upon hearing my ploy and slipped her mouth away.
"Sis?" Rebecca questioned as our eyes met.
I didn't know how to respond. Nevertheless, before I could think of some bullshit excuse Rebecca moved closer to my ear and as her hand lightly stroked on my pole, she whispered "You want to fuck your sister also don't you?"
I felt my dick jump and expel some precum as her taunting words sent new erotic pleasures though my body.
"Oh... Such a naught boy, Mike. First your mom and now your sister."
"No... I... I... Oh shit!!!" I said as her hand tightened around my stiff shaft and brought me closer to coming.
"Shhh... It's okay... just close your eyes and picture her stroking you."
I did just that, and felt my nutsack boil its hot seed to its pending release.
"I bet she would be a hot fuck, Mike. Having her sweet little pussy trying to take all of your cock inside her would be a dream come true, wouldn't it?"
I couldn't hold back any more as my ass bucked off the bed. "Oh fuck... I'm going to cum," I exclaimed and Rebecca quickly sucked my cock back in her mouth, just as I exploded.
I felt my entire shaft slip down her throat as my dick pumped and spurted its juices.
"Oh Rebecca... You're so fucking good at this," I said as I spewed the last of my seed inside her mouth.
I watched as she slowly eased my dick out and licked her lips.
"Mmm, Mike, your Sister doesn't know what she's missing, but maybe we can change that."
"What are you saying?"
"Maybe I can nudge her into actually wanting you."
I felt my dick again begin to harden.
"Would you be willing to fuck your Sister, Mike?"
"I... I'm not sure," I said, but in fact, the thought did get me quite excited.
Rebecca looked down at my penis as it slowly grew in size again.
"I think you can do it, Mike. I see your dick is warming up to the idea of sliding inside her."
It was true. My wicked thoughts had betrayed what little morals I had left. I indeed wanted to fuck my own Sister.
"Okay I would like it, but I don't think Sis would ever go for it. I heard how disgusted she sounded after hearing Dad wanted to fuck her."
"I didn't say it wouldn't take some effort to sway her, Mike. I said I might be able to get her interested. The rest would be up to you."
Just then it hit me. Another plan was building in my brain. If Dad truly did all this for a crack at Sis, what would he do if he saw me fucking her? Now I needed for this to happen.
"Rebecca I think I have an idea on how to get back at my father also," I said as I explained to her what I had in mind.
After I laid out the quick details on my new endeavor, Rebecca agreed and headed for the door.
"I think it might work, Mike," she said and quietly slipped out.