Movie Night
by Mushroom
Copyright© 2025 by Mushroom
Incest Sex Story: A big brother decides to relax in the basement when his baby sister comes in and says she wants him to watch a movie with her. But he has no idea what is in store for them when he agrees to do so, then realizes the movie is a porno.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa Consensual Fiction Incest Brother Sister Exhibitionism Masturbation Petting Voyeurism Caution .
It was after 9:00 at night, and the day had been blisteringly hot. I had mowed the lawn early in the morning, as that was the only chore I really had to do that day. And even though it was night outside, it was still almost 90 degrees.
I decided to go down to the basement and do some reading where it was cooler. I had a Tom Clancy book I had not read for a while, and was just getting back into the story when I heard the door to the TV room open.
“Oh, so you’re down here hiding again, big brother?” I heard a voice say, and smiled when I saw my little sister in the doorway to the TV room.
“Yep, it’s nice and cool down here, so a beer sounded nice.”
“Beer, you got a beer? Don’t let mom or dad catch you drinking their beer PC, they’ll tan your hide for that.”
I held up the can of Coors and took a sip, and looked at her. “Then I suggest you not tell them, or I might have to tell them some things you would not like them to know. Say, like catching you and Billy Foster behind the bleachers at the last football game.”
She squawked, and quickly shook her head and promised she would say nothing. She asked what else I was doing other than raiding the beer in the kitchen, and I showed her the book. “Ah, reading yet again. Come on PC, you really need to get out more. You know that?”
“Well, we all can’t be the centers of the school society like you are. I like solitude at times. I would be reading outside, but it’s still too hot and the bugs out there would be killer. To tell me sis, what are you doing down here?”
She giggled, and held up a videotape and said one of the girls at school had given it to her. She then asked if I wanted to watch it with her, and as I had read my book before I decided that might be fun. She turned on the TV as I moved my beer to the coffee table and turned off the light before we sat next to each other on the couch facing the TV.
She hit play on the remote, and the first thing I saw was one of those 1920’s era limos. And then a girl dressed for that time and a nun walking out of what looked to be a mansion. “Oh lord, AC. Not another of those indie films you love to watch!” I groaned.
“Oh shut up, PC. It’s only an hour and a half, surely you can bear to spend that long with me.”
I grinned and wrapped my arm around her shoulder, kissing her forehead and told her I always loved being with her, even if she was sometimes a pest of a little sister. And that was a way we sometimes shared affection for each other, using our initials instead of names. A lot of people thought it was cute we sometimes used PC and AC instead of our names. But nobody else did, those were mostly secret names we used for each other and nobody else.
Once in the car, it seems that I was correct. The woman had been raised in a convent, and after her father died she had to go home. She was of age, but had lived a sheltered life. She had been sent there after her mother died, so she was now an orphan.
And part of the stipulation of the will was that the girl named “Heather” had to marry before the end of the year or lose her inheritance. I groaned in my head, this was obviously one of those costume period dramas she so loved to watch. The kind that would keep her glued to PBS for hours at a time, as they showed a lot of them.
I told her I was about to go upstairs and read, and she quickly reached down and grabbed my thigh, demanding I stay at least a few minutes longer. “Come on, PC. Give it a chance. I was told this was a really good movie, and I don’t want to watch it alone.”
I sighed in my head and nodded. I lightly caressed her shoulder, and was just glad she was sitting on my left side. I tend to hang to the right in my shorts, and if she was on the other side she might have gotten a surprise if she had grabbed my thigh as high she had.
The other beneficiaries were discussing the contents of the will, and decided amongst themselves that Heather had to marry the gardener’s son immediately or they would all lose their inheritance. And after deciding that, one of the things they asked the nun was if the girl who was named “Heather” understood what her wifely duties would be. Of course the nun denied that, as they were a convent so knew of no such things themselves. So they decided to send Heather’s aunt to her room to instruct her on what would be expected of her as a wife.
Of course when asked Heather denied any knowledge of sex, and the aunt said she was going to teach her what her body was for. But I was shocked when instead of describing things in proper Edwardian terminology, the aunt had her pull up her wedding dress. Then getting down on her knees pulled aside her lace panties as she licked her own fingers, then inserted them into Heather’s cunt.
This was about the last thing I expected! “Sis, what the hell is this? Did you actually bring a porno tape down here to watch?” I demanded.
“Shhh, keep it down or mom and dad will hear us! Just relax, it’s not like you’ve never seen a porno before. My friend promised it was a good one.”
I grabbed the beer and took a long pull from the can, what in the hell was AC thinking? First coming down here with her sweet “Big Brother” talk, then having me watch a porn tape with her. I was more than a bit confused about this, and had some mixed feelings. But as we watched the aunt fingering her niece, she snuggled up against my side.
“Wow, she’s really hairy!” sis said, and I had to agree. The gal was sexy, and had a really full bush on her. Even between her thighs, as even in most porn I had seen with hairy girls most would at least shave between their thighs and leave the bush up top. And I stated this was set at like the turn of the century, so likely they would not be expected to trim for a bikini. And sis actually sighed as the aunt went down and started licking Heather’s pussy as she described the act of sex in more details.
And as she was fingering her and licking her pussy, Heather asked how her unmarried aunt could know such things. And it cut to a scene many years earlier. With the aunt describing when she was a much younger girl and her being seduced by an army officer. And as I watched, I had to admit this was much better than most porn I had seen in the past. The cinematography was as good as many movies, and the music and lighting fit it perfectly.
And it was rather sexy watching the officer and the aunt get into it. “She’s got nice boobs” I softly said, and even my sister had to agree with that. But watching her suck the guy’s cock, it was obvious she was not quite a maiden as she had proclaimed. That was clearly not the first time she had a cock in her mouth.
Sis even moaned when the aunt hiked her leg over the man and had him slide his hard cock into her. We both sighed a bit at that, watching his cock slide in and out of her as he held her big titties and sucked on her nipples. Then a bit later he climbed up so he was straddling her chest and started fucking her big old titties.
“PC, do guys really like doing that?” my sister asked, and I nodded. I told her it was a sensual thing, not only did it feel good but we could look down into our lover’s face. She said that did sound sexy, and moaned softly as the officer came on the woman’s face and chest.
“Ohhh, I might try that someday. But think I’ll skip that part.”
“What, you don’t like facial’s, sis?”
“Ewww, not at all! PC, that’s gross! Now maybe on the chest might be kinky, but not my face!”
And she pinched my side when I said she often wore so much make-up, that it really would not be on her face anyways but on top of layers of stuff she had already put on her face. I pinched her back but lighter, and she giggled as we continued to watch.
Of course they then had the wedding scene, and immediately afterwards the new wife entered her husband’s bedchamber. And as he greeted her, I gasped. I reached down and grabbed the remote control and hit pause. “What is it?” my baby sister asked, and I pointed at the screen.
“AC, that’s Saint Peter!”
“Wait, what? What in the hell are you talking about?”
“There, look! On the screen! Remember about a month ago when we watched ‘Jesus Christ Superstar’? That’s the guy that played Saint Peter! What in the hell is he doing in a porno?”
She looked at the screen closer, and gave a slow nod. “You know, I think you’re right! That does look like the guy. But that can’t be him, I bet it’s just somebody that looks like him.”
She had me hit play again, but I was positive I was right.
Of course, a minute or so later he lifted up the front of his nightshirt, and Heather for the first time saw what a cock looked like. And I let out a snicker as she exclaimed it was so small and looked cute. And sis was of no help, as she actually giggled. And after he encouraged her to stroke him and make it grow, my baby sister softly said that he was hardly small. And if her first one was that big she likely would have been scared.
And I felt her hand on my thigh squeeze tightly as the husband directed Heather to give him a blowjob. After a minute or two he had her stop, and she said she was now scared because he had grown so large. So he had her lie on the bed and started to warm her up.
Where for the first time we saw her topless, and Heather also had a nice pair of big soft tits. Then after a minute or so of playing with and sucking on them, he moved down and parted her hairy snatch with his fingers before going down on her.
Finally she was good and warmed up, and right as he was climbing into the saddle and about to stick it in her there was a frantic knocking at the door. Neither one of them wanted to stop, but their uncle on the other side insisted he had a letter Heather had to read immediately.
The husband answered the door, and accepted the letter. It was from her father, and in reading it, her father told her that no matter what she must never marry the gardener’s son because he was really her brother.
This time I hit pause, and looked at AC. “OK, baby sister! Want to explain to me why you came down here in this way, and insisted I watch a porn about incest with you?”
“PC, she never told me it was an incest movie! Honest! She just told me it was good and I should watch it, but she never said anything about incest. I swear!”
I shook my head, and decided to accept her at her word. I restarted the movie, and as the letter was read it turns out that the man she thought was her father was sterile. But her mother so wanted a baby, that he arranged with the gardener to trade places as they were having sex so he could impregnate her.
However, she was able to see in a mirror who it really was fucking her, and later on after Heather was born they started an affair and eventually ran away together. Where the two died in a shipwreck.
The husband and wife were shocked to learn they were also siblings, and the husband now makes his wife swear to a bow of chastity. Because of her sheltered upbringing she does not seem to understand why they can’t consummate their marriage, and the husband-brother leaves as she lies in bed and masturbates alone. With him doing the same thing listening outside her door.
“Wow, that’s actually kinds sad” my sister softly said. “They seem to love each other, and have to live together as husband and wife but can now never be together.” And at that I had to agree, that would surely be torture for them.
The screen showed that six months had passed, and they were still living together. But then the husband is seduced by one of the kitchen staff in the pantry, and before long he takes both her and the cook. And I during that I noticed that my sister’s hand was no longer squeezing my thigh, but caressing it. And as the husband was getting his cock sucked by both women, I glanced down. I had really not noticed that my sister was not wearing a bra when she came down here, but the way her nipples were prominently poking out the front of her long T made it obvious.
“Is my baby sister enjoying this?” I softly teased, and she blushed before looking up at me and nodding. As he was fucking the cook and occasionally having the assistant suck his cock AC went and got a blanket from the small closet. So she missed that he also fucked the cook in the ass, and she returned as he was cumming on her pussy.
Sis turned and laid on her side, putting her head in my lap as she pulled the blanket over herself. I rested my hand on her shoulder, and it turns out the husband-brother had been secretly peeking in on his wife-sister as she masturbated. And feeling guilty after fucking the staff, he decides to arrange for the chauffer to fuck his wife-sister in his place.
I caressed my baby sister’s shoulder as the chauffer took the wife out somewhere, and she made absolutely no resistance to him. In fact, when he seemed to hesitate she almost demanded that he fuck her. And it did not escape my notice out of the corner of my eye that my sister was squeezing her breast under the blanket as we watched that. As is the norm in these movies he takes her multiple times in different positions until he finishes all over her hand as she gives his still wet cock a sloppy blowjob.
“Wow, for being a virgin she’s really hot!” I said, and my sister nodded in my lap. I moved my head a bit and looked down at her, but with the blanket up to her neck I could see nothing. But it was obvious through it where her hand was, and she was still squeezing her breast under it.
I decided to be a bit bold, and resumed caressing her shoulder. But carefully moving the blanket down her shoulder as I did so. Maybe if I was careful enough I could actually see her squeezing her titty.
The husband shortly after sent the chauffer away, but then their cousin came to visit. And he seemed to be a bit simple minded, and was to sleep on the couch in the wife’s room. And the husband watched through the secret peep-holes as after getting restless, his wife-sister moved over and started to suck their cousin’s cock.
“OK, so she’s willing to fuck almost anybody. Her aunt, the chauffer, and their cousin. She even wants to fuck her brother, but he won’t let her. PC, you’re right, this is really strange. But also really hot.”
In that I had to agree, especially once she sucked him fully hard and climbed on him cowgirl style and started riding his cock. And she was obviously loving it, taking him in her over and over again and not knowing her brother-husband was watching it all.
“Well baby sister, what do you think of her brother watching her fuck their cousin?”
“Big brother, it’s wrong. But it’s also so sexy, it’s like he wants her so badly, but knows he can’t have her.”
“Well, that’s true. Tell me, do all baby sisters have a fantasy about their big brothers watching them do that?”
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