A Very Horny Birthday

I'm a single father raising two teenage kids: Sara, who is 19, and Mike, 18. My wife Julie decided after three years of marriage that she wasn't the family type and left us. It's been just the three of us since.

For Mike's 18th birthday I decided to rent a skin flick, buy a six pack of beer, and just have a "guy's night" with him. Mike has always been a little introverted, always studying to get good grades, and shy toward the girls. I figured our celebration might loosen him up a bit and let him have some fun.

We were about ten minutes into the flick and had just finished our first brew when Sara walked into the room. Immediately I became uncomfortable because I didn't know what she would think about what we were watching. She was the type who would consider a porno movie chauvinistic or immature. To my surprise, she just asked if she could watch too. I said sure and she plopped down on the couch next to Mike.

During the slow parts of the movie I glanced over at the two of them to see their reactions. Mike was riveted to the TV; I was sure he was a virgin and that this was the first time he had witnessed sexual acts. He studied every scene intently. Sara seemed nonchalant. Unlike Mike, I knew Sara had been sexually active because she had asked me to buy birth control pills for her since she was sixteen.

As the movie neared the end, Sara began to shift her legs around during each of the hot scenes. She had shared a beer with us and I figured the movie was starting to get her aroused. Mike's face was still glued to the TV. It had an effect on him too: the lump on the inside of his left leg was growing quite long. Sara became increasingly fidgety and finally placed her hand on Mike's leg. This startled him out of his gaze for a moment, as if he realized for the first time that his sister was sitting next to him. He immediately turned his attention back to the TV, not wanting to miss a moment of the action.

Undaunted, Sara slid her hand up Mike's leg and firmly gripped the lump in his pants. He jolted to an upright position and looked at her with the most shocked expression I had ever seen. She just looked back at him, with a half "I need you" look and half sly smile, as if she was thinking "you have no idea what you're about to experience."

Mike looked at me puzzled, not saying anything. He was expecting me to do something to stop his sister. I just shrugged and gave him a "whatever" look. Surprisingly, Sara was acting as if I wasn't even in the room. I was sitting in my recliner, separated from the two of them on the couch. I guess that gave her enough space to make her feel like they were alone, yet I was close enough to clearly see everything that went on.

Mike looked back into Sara's face. Without removing her gaze from him, she took his right hand and placed it firmly on one of her tits. He recognized his cue and squeezed it gently, trying to gauge its size and firmness through her bra. As Mike continued to fondle his sister's tit, she continued to stroke his throbbing rod.

"Stand up in front of me," Sara said, as she grasped his upper arm, trying to help him up.

Her words jolted me out of what seemed like a dream. I suddenly realized I was watching my daughter come onto my son. Mixed emotions flooded in: this isn't right. But the movie, beer, and the teens' actions so far made me a little horny, and I wanted to see more. I decided to sit back and see what would happen.

Mike was standing and Sara had positioned him directly in front of her. Sitting on the edge of the couch, she unfastened his pants, slid her fingers under the waistband of his shorts, and pulled his pants and shorts down with a single jerk. Mike's cock sprang out to meet her, pointing directly at her face. It was white and smooth, not having experienced the joys of sex. His balls were clearly swollen, probably from watching the movie and experiencing Sara's strokes.

The movie ended. The TV was nothing but snow and hiss now. I didn't want to shut it off for fear that my actions would break the chain of events. Sara caressed the inside of Mike's thighs, being careful not to touch his cock or balls. She was teasing him, making his passions rise. While doing this, she stared at the youthful rod in front of her face, admiring its length and thickness. Finally, she let her hand slide up to his balls and cupped them in her hand. Mike let out a moan. His cock jerked up in a spasm. Sara could tell her brother wasn't far from shooting his load so she wasted no more time. Grasping his cock firmly in her hand, she gave it a few strokes and then slipped it into her mouth. Mike let out another moan. My own member started to throb as I imagined what Mike must be feeling as his cock slides into a warm, wet mouth for the first time.

Sara worked Mike's cock like an expert. She licked it up and down, then rammed it into her mouth a few times. She looked up at him with a smile on her face as her tongue flicked over the sensitive underside of his rod. When I saw his swollen balls suck up into his crotch I knew he was nearing orgasm. Mike started to look anxious. His voice cracked and wavered as he said, "I... I... think you should stop now!" Sara ignored his plea as her head continued to bob up and down on his rod.

"Aaaahhhh," Mike yelled, as he unloaded his cum into his sister's throat. Sara kept the throbbing member in her mouth as it continued to spurt form its steaming stream.

Mike's cock quickly shrank and slipped out of Sara's mouth. She gave it a kiss, then Mike collapsed on the couch, his legs and arms sprawled out.

"Wow!" he exclaimed, as his shriveling member oozed out the last few drops of cum. Sara giggled, then stood up.

"It's my turn now," she said as she began to unbutton her blouse. She quickly removed her blouse and jeans, leaving only her bra and panties on. She stood still for a moment, giving Mike time to survey her body. I realized that I was seeing it for the first time since she was very small. Sara had been athletic in school and she was a cheerleader. Her body was toned and smooth. She was at that perfect stage when her body was taking on the sexy curves of an adult woman, yet still maintained a youthful firmness and glow.

As she stood in front of Mike she placed her hands on her hips, then crossed her arms as she slid her hands across her belly. Her hands slid up her sides, arms still crossed, until they reached her shoulders. This made her tits squeeze together and it produced the most amazing mounds bulging out of her bra. She uncrossed her arms as she slid her hands up her neck, over her ears, and through her hair. She stretched out her arms over her head, clasping her hands together. Then she stood on her tip toes, leaned slightly forward and arched her back. It was a wonderful sight: her young body was stretched out, her wide legs were long and slender, her ass was hiked up and out proudly, her belly was sucked in, her tits were pushed forward, and her head was tilted back.

Mike just stared, his mouth hanging open. My cock began throbbing again. Sara held that pose for a moment, then stood flat on her feet. She let her bra straps down, then held the cups over her tits as she slipped her arms out of the straps. After a short pause, she slowly peeled the bra cups down, revealing her ample tits. They were pointed, full, and sticking straight out. The little white triangles from her bathing suit and her bright pink nipples stood out like neon signs against her well tanned body. Her nipples were little pink mounds on the ends of her tits, like cherry halves on scoops of ice cream.

After removing her bra, Sara began rubbing her crotch. She pressed her panties into her slit and pulled them up slightly so that the shape of her pussy was clearly visible. Turning around so that her back was facing Mike, Sara leaned forward slightly, put her hands on her hips, then slipped her thumbs into the waistband of her panties. She slowly pulled them down, revealing the finest heart-shaped ass I had ever seen. When her panties fell to the ground, I noticed they were wet.

Mike's flaccid cock began to stir. My heart was racing. Sara spun around, leaned over Mike, and steadied herself by holding onto the back of the couch. This move placed one of her tits right in her brother's face. Mike wasted no time taking her luscious tit into his mouth and sucking on it with abandon. He massaged her other tit vigorously. Still standing, Sara spread her legs wide, making her legs look like an upside down V. At this point, I had the most awesome view of her pussy. It was shaved around her slit, revealing a smooth, light colored mound. Her lips peeked out of her slit, pink and moist.

Sara took Mike's hand that was massaging her tit and guided it down to her snatch. He groped around awkwardly, unsure of what to do. Sara took one of his fingers and parted her pussy lips with it. Then she guided it up to her clit and rubbed it for a while. Her hips swayed back and forth while she did this, giving me a wonderful show. She let go of Mike's hand, letting him continue as she closed her eyes. My cock was aching as I watched Mike's finger spreading her slit, exposing her opening to me. I wanted to plant my long hard cock deep in that sweet young pussy, and it took all the self control I could muster to remain in my chair.

By this time, Mike had a full erection again. Sara kneeled down in front of the couch and took his throbbing rod into her mouth. After getting it nice and wet, she stood up, turned around, and lowered herself onto her brother's cock.

"Let's see what you learned from that movie," Sara said as she began sliding up and down on Mike's shaft. Her tits jiggled playfully as she bounced up and down. Mike's hands were on her hips, then he slid them up her sides until they covered her tits. He held onto them like handles. In the meantime, I was watching Sara's snatch; it was hypnotic to see her soft pink lips glide up and down on Mike's virgin white rod. Soon his cock was glistening from Sara's orgasms; seeing it really turned me on. My cock was throbbing and straining to get out of my pants. I felt sure I was going to explode at any minute.

For the first time since this episode began, Sara looked over at me. Seeing the big bulge in my pants and the pained expression on my face, she motioned for me to stand next to her. I sprang from my chair and moved across the room. As I approached her, she reached out and stroked my bulge. Unlike Mike, I didn't need to wait for anyone to undress me; I quickly dropped my pants, liberating my swollen, pulsing rod. Sara's eyes widened. My cock is much larger than Mike's, and my balls were enlargened from watching all the action.

Mike looked at me briefly and gave me a strange expression. I couldn't figure out what he was thinking. It didn't matter though, because he quickly returned to watching his sister's ass bounce up and down in front of him.

Sara stroked my cock as she continued to fuck her brother. I was about to shoot my load all over her when she suddenly stopped. Panting from the workout, she let go of my cock and leaned forward. She raised herself up until Mike's cock was about to slip out, then she began to slide up and down in small movements, not taking the whole thing in. I figured out what she was doing: she was letting Mike see his rod slide in and out of her pussy. Mike was taking it all in. As I watched, I realized that my daughter was a great fuck - no wonder she needed the pill.

Sara stood up and got down on the floor. She was on her hands and knees with her ass facing us. After arching her back so that her ass pointed up in the air, she spread her pussy lips wide open, exposing her gaping hole. My disappointed cock jerked at the sight.

"Come and get it!" Sara said to Mike. He walked toward her, his young hard cock swaying. Kneeling behind her, he took his rod in his hand and guided it into her soft, warm and wet hole. I was ready to cum again. How I wished that was my cock sliding in there!

Mike started pumping with long slow strokes at first, but it wasn't long before he picked up the pace. Sara looked around at me and motioned for me to stand in front of her. As I stood in front of her she looked up at me and patted the floor directly below her.

"Lay down here," she said. I sat down in front of her, letting my legs slip between her arms so that they were directly under her body. I leaned back, propping myself up on my elbows. My cock was directly below Sara's face. As she began to suck on my swollen member I watched Mike fuck her from behind. His eyes were closed and he had an intense look on his face - I could tell he was really enjoying the ride. Sara pulled my cock out of her mouth.

"Fuck me harder!" she screamed at Mike. Mike picked up the pace some more. I slid over to my left a little so I could see more of Sara's body. She continued to work on my cock.

"Ram me! Ram your cock in me!" Sara screamed again. Mike slammed into her with everything he had. Her ass rippled from the impacts and her tits were swaying wildly.

It was more than I could take - the recent years without sex, the porn movie, teens fucking... My balls were about to unleash the biggest load they'd ever had. I couldn't hold it anymore. I sat up and grabbed Sara's head as I felt teh warmth welling up inside me.

"Aaahhh," I moaned as my cock exploded inside her mouth. Sara gave out a strained "Mmmmph" as she tried to contain the buckets of cum I was shooting down her throat. I watched my cock pulsate as it continued to deliver its long overdue load into my daughter's waiting mouth. I laid back and closed my eyes, savoring the peacefulness of my release. I thought about what had just happened. Did Sara really understand my need? Where did she learn all this?

I heard Mike let out a yell as he delivered his final strokes. His pace slowed rapidly until he finally stopped and collapsed on Sara's back. I thought about his hot cum spurting deep inside her sweet young pussy. What a lucky guy. I was satisfied though. Sara looked up at me and gave me a sly smile.

"Happy birthday, brother,"she said as she continued to look at me.

In the months that followed out little episode, nothing was said about it. It was like we had an unspoken understanding that it was a one time thing. Our lives have continued pretty much the same as before, except for one thing... Mike isn't as introverted now.