Watching My Sister

by lastone

Copyright© 2018 by lastone

Erotica Sex Story: A teenage boy accidentally stumbles upon his younger sister and her boyfriend about to have sex. He can't decide if he should stop it or watch it.

Caution: This Erotica Sex Story contains strong sexual content, including mt/ft   Teenagers   Consensual   Incest   Cream Pie   .

I went looking for my fishing pole; it was usually in the utility room just off the central part of the basement. Dad had started to fix over the basement last year but it had come to a crawl as of late. The walls had sheetrock but hadn’t been finished off leaving gaps at the seams, the floor had a rug with nice dense padding and the ceiling was almost finished. The utility room was dark as I fumbled around piles of crap trying to find the tackle box when I heard footsteps coming down the stairs. Not thinking much about it figuring it was only my bratty sister I continued on. When I heard another voice, a boy, only then did I take notice.

Sure enough it was Sandra and a friend, Billy, who she sometimes hung out with. They were both whispering which took my curiosity. Quietly I stepped back as not to be seen and waited to see what was up. There they stood about a foot apart gazing into each other’s eyes before grasping each other around the waist.

“You sure it’s OK down here Sandra? Maybe your bedroom would be better?

We won’t get caught will we?” “No silly, no one’s home you saw the note Rob left about fishing, we have at least an hour before my Mom gets home.”

Now they had my full attention, to Hell with fishing, I was going to see what they were up to; it’s always good to have a little dirt on your sibling. As they swapped spit I delicately pushed the door shut as to not be seen. Dad had left a horizontal seam next to the door with a large enough crack to allow someone like me to view the surroundings in the main room without being detected.

Billy’s hands had traveled onto my sister’s ass where his fingers were nudging into her ass crack. As he worked them downward I was speechless when they disappeared into the leg band of her short-shorts. This guy knew exactly what he wanted and was getting it. Within a few minutes they slouched downward ending up in a pile on the forest green rug in a tangle of twisted arms and legs as their persistent kissing seemed to advance a tad too quickly.

After all she was only fourteen, a little young to be behaving in such a manner. Never once did she make an objection to Tommy’s headway when removing her shirt. One button at a time came open until he pulled the sides apart exposing the white skimpy bra covering the flesh mounds of her chest. Her breaths commenced into sudden gasps after pulling the scanty elastic over her tits brushing his lips over the enlarged nipple. Her eyes were clamped shut but her hands held Billy’s head firmly in place as he sucked in a nipple, guessing from his expression he had his tongue swirling around the nugget.

I had an extraordinary view from my advantage point, they were so close that if the wall wasn’t there I could have almost reached out and touched them. Here was my sister, a year younger than I; she has her friend attempting to drain her breast of any non-existence milk! I had to wonder how long this activity had been taking place, but what happened next I assumed it unquestionably wasn’t the first time. He had a concealed hand that came into sight as it unbuttoned the top snap of the blue shorts and disappeared into them.

“Don’t break the zipper Billy” as his hand stretched the fabric to its limit. And he obliged un-zippering them entirely exposing a white pair of underwear that covered his other hand as Sandra wiggled around on the floor. It was when she reached between their bodies that I noticed it, there it was, hard and confined; my own dick was at full staff. My own flesh and blood, my sister was causing this. I was torn between stepping out into the room and stopping them or continue with my soiled thoughts of maybe seeing considerably more. Sexual desire always wins. Cautiously his belt was unfastened followed by his pants button and then the zipper came down. She didn’t stop there either, distorting his body relinquishing to her desires, his pants ended up at his ankles in less than a mere minute.

His body was in the identical condition as mine, the front of his briefs was bulging out while covering his erect dick.

In the mayhem I never saw it happen, but Sandra had dispersed of her shorts completely, tangled up around her foot while Billy was busy working his fingers around her pussy zone. In all of ten minutes the only clothing left on the two teens was their under garments, and they weren’t on for an extended span either. Sandra’s hand planted firmly on Billy’s dick caressing the length of if as it strained to be set free. Moving first, yanking the front of them downward followed by him pulling the panties over her hips leaving both of them nude.

My mind compared his dick to mine, realizing I had at least an inch maybe an inch and one half greater but the girth, maybe a year in age did something but without doubt I had an enormous dick compared to his. What happened next came as a surprise, Billy’s kisses trailed down her torso over her belly then into the fine downy black hairs of her bush prompting Sandra’s legs to instantaneously widen.

“Ohhh Billy that tickles, but it feels so good at the same time.” Bodies distorting again until Billy was now on his back, Sandra crawling on top of him still grasping his dick when I let out a small gasp when she raised her ass up giving me an eyeful of her cunt. OMG what a sight, her slit wet from Billy nibbling, barely any hair on it was just plain beautiful.

Lowering her ass into Billy’s face as she stroked his dick, “Don’t even think about cumming in my mouth!” then her mouth descended over the helmet shaped tip immediately making slurping sounds as they sixty-nined each other.

Just too much for me, I had been rubbing my own hard-on since the clothes were shed, to Hell with it, my pants fell to my knees, out came my hog, my hand clutched it tightly as it slid up and down the length of it.

For the next few minutes I was treated to the best gratification a guy could have, the two ravaged at each other’s sexes gobbling and devouring.

Definitely wasn’t their first rodeo, who knows how long they have been doing this for, in reality I was jealous, why couldn’t I find a girl willing as my sister. At that point I didn’t give a shit if she was my sister, I was horny and was tempted to bust into the playroom kick the crap out of Billy and then fuck Sandra, that’s how hot and bothered I was.

Lucky guy he was.

I had never considered an asshole to be erotic but looking at her brown-eye pucker up as Billy’s tongue slithered into her cunt I began to ponder it. But as quickly as they started the show was over, or I thought, Sandra scooted downward on his torso, still facing away from me she sat down on his dick and commenced to gyrate on it. Shit they were going to fuck. Up came her ass grabbing his cock, positioning it at her hole then pushed her body downward sliding the full span of it up into her cunt in one swoop as her head went rearward. The room suddenly became alive with noise. “Holy shit Sandra, damn that feels good, you’re still as tight as the first time we did it.” “I keep it tight for you Billy; I know how much you like it. Now don’t you go blowing off those balls of yours anytime too soon ... You always seem to do it too fast and today’s special don’t forget.” “How could I possibly forget?”

I wasn’t sure what they were talking about but as Sandra started to raise up and down on his cock the talk became broken murmurs. Man, what a pussy she had, leaning forward both her boyfriend and I had a perfect view of her pussy and bum hole. With Billy’s urging she fell forward, flat on her tummy causing his dick to pop out of her little hole. Crawling onto his knees Billy pulled her rump upwards. Just my luck the show was over as he plowed into her as she came up onto all fours, just like two dogs fucking. It seemed as they couldn’t be satisfied with one position. He plowed her pussy from behind for less than a minute before twisting her onto her back which was great, I couldn’t see anything of her cunt in that position.

There she lied, naked, beautiful, about to be fucked again, a sight to behold. That twerp Billy was violating my poor little sister, mixed emotions were scrambling across my brain, she really shouldn’t be fucking at a young age, I didn’t know what I should do, but I ended up erasing the thoughts away when Billy took her ankles, raised them upwards while lying onto her small frame. His pecker searched for her waiting hole sliding past it several times before connecting with it. “Oh Billy stop teasing me, fuck me now will you, I need it bad, I’ve waited all week for this.”

His dick was gone from sight leaving his balls resting against her pooper. With her legs raised so high it was perfect viewing for me. Their bodies connected by his dick, her cunt snugly fitted around it I noticed how floppy his balls were, maybe from the warm temperature of the room, or the excitement, or from being full, not sure but I watched them as he withdrew slightly only to plunge hard into her cunt. For the next minute I heard his balls slapping against her ass as they both grunted heavily. I had to halt beating my own meat, looking down at my dick it was almost too late, the skin stretched tight as it swelled, the tip expanded as it started a slight twitch, I held my breath and contracted every muscle I had below my waist trying to prevent it from spewing out any juice.

In a whisper: “Getting ready Sandra, I only have a minute left at most.”

“No don’t say that, you promised, it’s too soon, please Billy a little longer.” The plea of desperation went unheard as his rhythm picked up.

Wordless compassion for my sister’s unfortunate circumstances was of no benefit to her, Billy on a mission sawed even harder each time he impaled her teenage hole, slap-smack, slap-smack went Billy’s balls against her pasty colored ass cheeks. “I love you. I do. Are you sure it’s OK?” “For the last time Billy I’ve told you all week I would be in my safe period, we lost yesterday so it’s either today or next month.”

Then it came together, she can’t get knocked up since she will be bleeding soon, and he’s going to fill her full of seed. Son of a bitch that’s what he is just a son of a bitch, first he’s fucking my sister and he’s going to finish her off by blowing off his cum inside her. I watched as his rhythm intensified, her legs flailing in the air pushing her body upwards each time he sank into her cunt. When he withdrew he was pulling her cunt lips outward as they attached themselves to his dick forming a taut seal around his dick.

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