My Reluctant Sister
by Mystic47
Copyright© 2025 by Mystic47
Fiction Sex Story: I found my sister's boyfriends phone which had some hot texting between them, and even hotter pictures of her. She would have to pay a price to get the phone back.
Caution: This Fiction Sex Story contains strong sexual content, including mt/ft Blackmail Coercion Fiction Incest Brother Sister .
She was on her back, on her bed with her phone in hand sending a message to someone. She wore a dark blue midriff length tank top and pink lacy panties, nothing else. I stepped to the bed and sat next to her. She lifted her large brown eyes from the screen of her smartphone, quickly pulled the corner of her blanket over her legs then demanded, “What are you doing here?”
“Let’s have sex.”
Her eyes widened in surprise, “What the hell? What did you say? Sex? No way! Get out! No, I’m not going to do that.”
“Hey, we’re alone, Mom and Dad will be gone for hours.”
“Are you insane? Get out of my room!”
“Come on Karol, I know you put out, Paul has been screwing you so it’s not like you’re giving up something precious.”
My sister bloomed red in the face and sat up straight on the bed, she shouted, “What? Has that bastard been talking about us? What’s he saying, who knows!?”
“Everybody knows, you were the number one school rumor ten minutes after you crawled out of the back seat of his car. I think it was like four months ago. Why do you think you got so popular all of a sudden, why guys keep asking you for dates?”
Her face blanched white, her lips compressed in silence as she stared at me forever with unreadable eyes, her pose told me she was freaked out, “Paul told everybody we have sex?”
“Well, I’m pretty sure he hasn’t said anything to Mom and Dad. Come on Sis, let’s get it.”
“Get the fuck out of my room!” Abandoning modesty, she slammed away the blanket then leaped off the bed and grabbed my shoulder to push me out of her sight, “Get out you perverted sonofabitch; I’ll never fuck you! You’re my fucking brother and shit like that is totally wrong, GET OUT!”
I didn’t feel rejected, I didn’t cringe in shame as I left her room. She slammed her bedroom door so hard the walls shook while swearing like an unpaid whore at my back. Not only was she pissed at me, but her relationship with Paul was about to come to an end. I left quietly, without argument, because I knew something she didn’t. Karol would have to give in and let me because I had something; something she would not want our parents to see. I had Paul’s smartphone and he had a ton of pictures of my sister; many were not suitable for the family scrapbook.
Why did I have my sister’s boyfriend’s smartphone? He left it on a side table two nights earlier after visiting our house. I found it and fully intended to give it to Karol, but then I figured out his swipe pattern and started looking and reading. Some of the texts between him and Karol were not just texting, they were sexting, some damn hot sexting. Then there were the pictures. Pictures of her in the back seat of his car, in his house, selfies from her room, and some even taken at the park at Loon Lake. She did have clothes on in most of the snapshots, but some exposed a lot more of Karol than I’d ever seen. Without clothes, my sister was a wet dream in progress. There were porn-quality pictures of his head or cock between her legs, her mouth on his prick. The hottest picture though was a closeup of her pussy dripping big globs of cum; that one made my cock swell up fast. He also had a couple of POV videos that revealed a lot about her and what she did for him. My sister’s unclothed body, the poses she took, and what they were doing, were like doses of steroids to my libido. I was determined, if he could do it, I could do it.
I didn’t find any clue that he had been sharing the pictures of Karol with anyone or on social media, so her secrets were between just them and me. But that could change. I waited until Karol could look at me again without burning red and swearing; about three days. When she stopped leaving a room when I came in, I decided it was time to hit on her again. I knocked on her open bedroom door, and she acknowledged my presence, “Hey look, Karol, I didn’t mean to make you upset, I’m sorry,” I lied.
She looked at me warily, wanting to trust me, but not letting herself, “Sorry? Sorry for what Paul said, or sorry that you want to screw me?”
I ignored the question, “Did you kick Paul to the curb?”
“To the curb, over a cliff, and almost into a hospital. I literally kicked him in the balls, he was rolling around on the floor asking me why.”
“Did you tell him?”
“Hell yes! That cocksucker won’t ever say fucking shit about me again.”
Her language wasn’t for public ears just then but it gave me added fuel to do the reveal, “Did Paul lose his phone?”
She looked at me for a few moments, suspicion growing in her eyes, “Well, yeah, about a week ago. Why?”
I said, “I have it.”
Karol froze in place, her eyes burned into mine then her cheeks turned red, she asked, “Are you going to give it back to him?”
Time for the bombshell, “You want me to delete the snaps before I do?”
She sprang off her bed, “You hacked his phone, you saw the pictures!? Give it to me!”
“I don’t think so Karol, I’m going to hang on to it for a while,” I left my sixteen-year-old sister standing in her room looking both enraged and devastated.
Later that day I was gaming online when she came into my room and sat quietly on the edge of my bed. I glanced at her but wasn’t about to die in a toxic cloud just to ask her what she wanted so I ignored her while my buddy DethDeeler lobbed Annistat Nuclear Grenades through a time-warp bubble. Karol sat and fidgeted until I could pause without dying, “What?”
“Can we talk?”
I signed off with my team and set the controller aside, “What about?”
“You know goddamn well what about,” she snarled.
I was blunt, “About all the blowing and screwing nudie pics on the phone?”
She dropped her eyes to the floor and nodded slightly, “Yeah,” she sighed. She looked back at me and pleaded, “Dwight, you can’t show anybody, you can’t tell anybody. I would kill Paul, you, and myself if any of that got out.”
I sat back and studied her. She is my sister and despite what I found, she was still someone I wanted to protect, to keep her safe from harm in any form. She was family. Family comes first, “Karol, I won’t ever do anything with what’s on the phone unless you go totally bizarre on me. You can have the phone and delete all the evil shit on it, or if you want, give it back to Paul, that’s up to you.”
She eyed me skeptically, “I can have the phone?”
“Sure, I have no reason to keep it.”
“That means you already copied all that stuff, doesn’t it?”
Karol may be blonde, but not stupid, “Not the texts, just some pictures.”
Anger flared across her face and I thought she was going to say something vicious, but the moment passed, “Give it to me.” I took the smartphone from its hiding place and showed Karol how to swipe it open. She grumbled, ‘Thanks’ as she left my room.
I kept my silence for another week, the entire time Karol was edgy whenever my parents were together with us. She didn’t need to worry, I wasn’t about to say or show anything to them about her, I had other plans. Finally, she couldn’t take the strain any longer.
“Dwight, I need to talk to you.”
I was Forging an Empire and didn’t pause, “What?”
“Stop the game,” she commanded.
I did her bidding, “Okay, what’s up?”
“Are you sure you didn’t copy the texts?”
“Didn’t, kept just a few camera shots.”
“What are you going to do with the pictures?”
“Donno, maybe keep them as a wedding gift for your new husband.”
“Goddamnit asshole, this is serious. If those ever get out and Mom and Dad or my friends see them, I might as well run away and change my name.”
“Come on Karol, are you dim enough to think pictures like that would never go public? Be fucking glad Paul lost the phone, otherwise that shit would be on TikTok or Snapchat right now.”
She was pleading, “I know, I was stupid. Please, Dwight, say you won’t do that, please delete them”
“I don’t know girl, you’re pretty damn hot, I get a big fucking boner looking at them, other guys might too.”
Venom flashed from her eyes, “Fucking pervert, is that all you can think of?”
“The truth? Yeah, I think we could have a really nice time if you want the pictures back.”
Warily she asked, “What do you mean?”
“What the hell do you think? If you want them back, if you want me to delete them from where I put them, you’re gonna have to earn them. I have 23 pictures of you nude, near-nude, and doing some pretty hot shit with Paul. If you want to be sure they never get out, you gotta put out.”
Her jaws clenched, her brows pinched in anger, “Cocksucking, Motherfucking Bastard!” she raged as she fled my room.
20 minutes later Karol sent me a text, ‘Can I come over’
‘sure’
My door opened halfway and my sister stuck her head in, “Close your eyes.”
I shut my eyes half expecting her to shoot me in the balls or something but heard her feet shuffle across my floor, then the bed groaned softly, “Okay,” she said.
I turned to see Karol on her back with my blanket pulled to her chin, she looked like she wanted to be anywhere else when she said, “Come on, if I have to do this, let’s get it over with.” As I looked into her angry brown eyes my cock exploded to giant size. I tugged on the blanket but she gripped it harder in her hands. I pulled with more force so she let go, it slipped down to her waist to reveal her nudity. She rolled her head away from me as she bloomed red in her cheeks, down her neck and across her firm-standing B-cup tits. I tugged the blanket farther down and almost came in my pants as I looked at the puffy outer lips of her barely hairy pussy. It took me only seconds to strip from my jeans and briefs.
Karol moved her eyes back to me and glared at my erection while it swung back and forth as I got on the bed. I tried to push her legs apart but she resisted and snarled ominously, “Take the goddamn shirt off.” My t-shirt fluttered to the floor in less than a moment. Karol’s eyes radiated hate as I propped up on one arm over her, she spread her legs far enough to let me in. I grabbed my cock and rubbed it up and down her slit. She was dry so I hawked a gob of spit and wet the end of my erection then put the palm of my hand on her pussy to rub her wet too. She jerked at my touch and turned her bright red face to the wall again. I bent my back, then with a lot of anticipation, pierced her with the head of my hard-on. I pumped three or four times, pushing deeper until I felt her pelvic bone against mine. I was as deep into her as I could get so I started blackmail fucking my very angry, very sexy little sister.
I knew she submitted only because she wanted the pictures so I didn’t worry if she enjoyed what we were doing. She wasn’t hot and turned on, she just lay there and took what I was shoving into her with no complaints or censure. Since I was screwing her the first time and she was forbidden fruit my lust reached the boiling point in just a few minutes. Karol watched me carefully and when she saw me tensing, she slammed both hands on my chest and pushed me up, “Don’t you fucking cum in me, no way!”
“Come on Karol, if you get knocked up you can blame your boyfriend.”
Her brows squeezed together and she snarled ominously, “No, not ever. Remember, I don’t have a boyfriend and I won’t be forced to marry some first date just because you don’t have ball control. If you cum in me I’ll go straight to Dad and scream rape.” Fairly warned I thrust back into her and then with a couple more strokes, reached overload. It took a lot of concentrated effort to pull out of her velvet pussy to shoot long streams of cum all over her stomach. I was on my hands and knees over her body when she looked up at me and grumbled, “Fuck you, Asshole.”
I was done blowing my balls, but as I looked down at her my cock was still hard with lust. Just seconds after my cock stopped cramping, I pushed up and into Karol before she could protest. The first thrust was just to feel her tight pussy once more before I left, but the feeling of the hot soft tunnel spurred me to pump her again. She gasped, her eyes flew open and she tried to push me up and off, but she felt so good I wasn’t about to stop until I came a second time, I went to my knees between her thighs, grabbed her hips, and pulled her against my groin. God, she was awesome. She protested the second assault briefly but must have accepted that she had to let me rape her. She didn’t turn away; she lay on her back with a blazing stare that scorched my face.
I was getting less spontaneous about screwing Karol; I mean I took more time to admire her while I fucked her. My eyes roamed from her livid eyes down her neck over her quivering tits then along the length of her flat, taut stomach. I watched my erection slipping in and out of her for a few moments then raised my eyes to hers again. At first, she was resistant and defiant, but since I was being more attentive to her, her demeanor was less menacing and the tenseness in her body was waning. She was quiet while I fucked her for maybe five minutes then slowly, she started to respond. She pulled her knees up, laying her thighs wider, her hands moved off the bed to rest lightly on my hips and her eyes transformed from hostile to a less critical acceptance of what I was doing. I wanted to know if she was getting into fucking me so I paused and pulled my erection out. She looked at me anxiously and asked, “Did you finish?”
“No.”
Looking slightly relieved Karol didn’t say anything but tightened her fingers around my hips and pulled me back down so I slipped back into her, “Hurry up, get it over with.”
Her pussy was getting warmer, softer, and wetter as her hips began to roll in sync with my thrusts. I took a breath and asked her, “You like this don’t you?”
She closed her eyes, pressed her lips together, and turned her head to the left, “No.” She tried to deny me but I could feel her thawing.
The pressure in my nuts was building, my erection was bloated with semen. I rolled my hips to get as far into her as possible then stopped holding back, “I’m gonna cum!”
She snapped her head around to watch my face then warned again, “Not in me!” I fell flat on her, covering her from thighs to breasts then put my hands under her ass and pulled her tight against my groin. I managed to free myself from future ruin as she tried to push me off. I surged repeatedly down the crack of her ass, making a huge Rorschach blot on my bed. After I stopped humping and spewing, she lay still, and turned her head until her nose was next to my ear, “You fucking pervert, I hope you go to hell.”
I lifted my head and pushed up and over until I was lying by her side. Karol was watching me with indifferent eyes while her fingers dipped into her freshly stretched cunt. As I huffed for breath I asked, “That wasn’t too bad, was it?”
“That was blackmail and rape you goddamn degenerate,” Karol got off my bed, grabbed my t-shirt to wipe the goo off her skin then left my room. I fucked my sixteen-year-old sister twice in a half hour so as I watched her ass sway away, I decided I would delete two photos. I swore to myself she would earn the next 21 pictures one at a time. I sent two snaps of Karol where she was partially nude with the note ‘deleted these two’. She shot back ‘What about the others?’ I gave her the conditions; ‘one for one, I have 21 more pictures.’ She didn’t write an answer but sent 21 scowling girl emojis flipping me off and darting daggers out of their eyes.
Mom and Dad wanted to go kayaking the next Saturday morning. They had asked Karol and me if we would go but before my sister could answer, I caught her attention and shook my head. A flash of understanding furrowed her brow and we declined our parents with excuses. That morning, I waited impatiently until they left; as soon as the truck was out of sight, I went looking for my morning fuck.
She was sitting on her bed, legs crossed at the ankles, knees far apart. Her sleeping gown pulled far up her thighs; she wore no panties. She looked up from the tablet resting on her knees and said bluntly, “Make it quick, I need to be at Kathy’s by 10.” My prick which had been half-hard all morning gained weight and strength while I started pulling off my clothes. Karol put down her iPad then reached under her pillow and pulled out a condom, “Use this today.”
My cock was straining against the skin holding it together, angled up toward the ceiling fan, “Only one?”
Karol looked purposely at my erection then for the first time since I approached her for sex, smiled slightly, “Only one at a time.” Her attitude, her pose, and her demeanor gave me the impression she wasn’t as mad or upset about what I wanted; she wasn’t inviting me, but she didn’t radiate hate or repugnance. I got on the bed next to her then tugged on the night shift, she raised her arms and let me pull it off. When she was naked, I put a hand on her left breast and massaged it while putting pressure on her to lie back. My sister reclined on her mattress then moved her hand to grip my hard-on, “Do it better this time,” she directed. She evaluated my erection with her fingers then moved her hands to the bed and turned her head to look out the window. Karol wasn’t going to take part in the exercise but she wasn’t going to resist or reject me, my cock stiffened even more. I cupped her pussy with a hand and started fondling the breathtaking teen girl.
Karol didn’t take an active role, she wasn’t forward or aggressive, but she let me feel, massage, caress, and fondle her. At first, she just lay completely unmoved, her eyes watching nothing out the window. It was when I bent to nibble a nipple that her left hand came up to rest on the back of my head. She twitched her fingers in my hair while I tickled her tits. With my mouth busy on her breasts, I slid a hand across her stomach and down her legs, paying attention to the silk-smooth skin of both thighs. I trailed my fingers up her left leg then slid my long finger down and into her slit. That touch on her pussy caused her hips to bounce and a quick sip of air. Karol rolled her head to the right, closed her eyes and the space between her legs widened. My erection was beginning to hurt from being stretched so tight, I lifted my head from her tits, “Put it on me.”
She didn’t have to ask what I meant, she sat up, grabbed the condom packet, and ripped it open. Karol pushed on my shoulder until I was on my back and grabbed my cock. The touch of both hands on my stiff prick damn near set me off but I managed to clench the urge to cum. My sister inspected my erection and then rolled the condom down the thick hard shaft. When it was in place Karol stroked me while offering me options, “You want me on top, or under? How about from behind?”
“How do you like it?”
“Doesn’t matter, I’m not doing this for me, just tell me how you want to screw me.”
I know fucking well I moaned before I directed, “Ride me.” Karol threw her leg over my groin, sat with her ass on my thighs then rose on her knees high enough to hold my erection while she lowered onto the lubricated rubber. I put my hands on her hips and began thrusting into her while she rested her hands on my chest. My sister and I coupled like that for a few minutes then I flipped her off and over to her stomach. I mounted over the tight round cheeks of her ass then pushed into her until my pubic hair was caressing her butt, Karol moaned. I pumped her deep twice and just as I fought off another semen-filled convulsion we heard, “Karol, Dwight, where are you?”
Holy shitting fuck! Our mother had just called out, looking for us! I scrambled off my sister and her bed then darted to her closet. She snatched up my clothes and the condom wrapper and shoved them toward her feet then covered herself. Karol had just pulled the blanket up when Mom knocked on her door, “Karol? You in there?”
“Yeah Mom, I thought you left?” I was surprised by how calm the girl sounded.
Mom opened the door and peeked in, “We did, but your father forgot the paddles for the kayaks. Why are you still in bed?”
“Come on Mother, it’s Saturday, I don’t have to go to school.”
“Okay. Where’s Dwight, he’s not in his room?”
“Who knows, I’m not his appointment secretary.”
“You know Karol, you could be a little more caring about your brother.”
Mom closed the door and I started breathing then pulled the rubber off my deflated prick. Karol opened the closet door about an inch, “I’ll tell you when they leave.” I took a calming breath and nodded to her. After a quick good morning to Karol who had left her room, our parents got into the truck and left again.
The party was over. I was so paranoid that Mom and Dad would come back a second time I couldn’t bring myself to approach my sister, and she didn’t suggest we finish either. I did send and delete another picture, one where she was partially nude, for the partial fuck.
Five days passed. Mom was clipping rose bushes and Dad was working when Karol stepped into my room, “Mom says I should be more caring about you.”
“You should. I’m your near and dear big brother, you should cherish me.”
She scanned over her shoulder into the hall and checked for witnesses then closed the door quietly, “You want to be cherished right now?”
“Huh? What do you mean?”
“I mean you have to delete more pictures.”
My cock started swelling as I pushed away from my Sociology book and went to her. Karol rubbed the growing bulge in my pants then quickly opened my belt and zipper. She pushed my pants to my knees then grabbed my hand and guided it under her skirt. She wasn’t wearing panties. She backed up to the wall, pulling me closer. I put my hands under her ass, lifted her off the floor then she wrapped her legs around my waist. I poked between her legs until I found her then rolled my hips, piercing the warm wet hole. She bent her back to put more pressure against me then put her arms around my neck, “Don’t wait, Mom could come in any time.” I put her back against the wall of my bedroom and fucked Karol as if we had just gotten married. She laid her head on my shoulder, her breath was hot on my neck, and she began to whimper vowels and rock her hips; her pussy began to flow with sex fluids. Karol lifted her head to whisper, “You can do it in me,” then bit my ear. I cramped and convulsed then filled my sibling with a load of hot fucking incest. When I was done, she lowered her legs, kissed my cheek then said as she opened my door, “That should be worth two.” Not a problem. Ten minutes after my sister let me cum in her, I sent her the two hot videos, then shredded them from my files.
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