The World's Nicest Sadist

I woke up the next morning at my usual time when I don't have to set an alarm and lay in bed until a bit after ten. Since I knew Cassie wouldn't be up until around noon so there was no rush to get downstairs for breakfast. If this was a movie maybe I'd go downstairs the morning after our dramatic night and she'd be sweetly cooking me breakfast, but nope, even not wandering down until after eleven, I found the kitchen quiet and cold.

I wasn't terribly mad about Cassie's prank. At least, I don't think I was. She was always playing silly pranks on me, usually they involved her pouring cold water on me in the shower or her sneaking around and scaring the crap out of me with an airhorn. If the big prank was that I spanked her really hard, uh, wasn't the joke kind of on her? The bruises were on her ass, not mine, that was for sure.

Mostly I found it interesting that she wanted to be spanked so badly that she'd stage that whole ridiculous scenario. I was vaguely aware that some women were into S&M, which stood for sadism and masochism. I suppose she'd be the masochist, but I didn't like that it made me the sadist. I didn't want to be someone that enjoyed hurting people. I only spanked her because I thought she deserved it. It did feel exciting in a way, though, to hurt a very willing victim, to have her give me that power over her. I'd never enjoy hurting someone who didn't like it. Maybe I was the world's nicest sadist.

At any rate, I couldn't have an S&M relationship with my little sister! She came down just then before I could finish this silly line of thought. She was wearing a pink bathrobe and by now I knew there was nothing underneath.

"Hello Cassie," I said.

"Hello Mike," she said, oddly subdued. She sat down at the kitchen table and winced, then looked at me with a smile, which was an odd reaction to the pain, I thought.

"Your turn to cook," I said.

"Well you coulda told me that before I sat down!" she whined, but she got up carefully then went to the fridge, walking very awkwardly. I'd have felt bad except it was just bruises, and at this point it was obvious that she liked the pain. "You want omelettes?"

"Yeah sure," I said, then realized per our labor-sharing agreement that since she was cooking I'd have to clean up the mess afterward, which would be considerable with Cassie making omelettes, but I figured it would be worth it. Against all odds, Cassie was a pretty good cook, one sign that our parents influence had rubbed off on her.

"Am I streaming today?" she asked. You'd think she'd know, since she was the streamer, but Cassie was never one to sweat the details.

"Nope, nothing on the schedule today," I said, "You can go party with your friends I guess."

She shrugged. "I dunno," she said, "They're kind of losers."

"How's your butt?" I asked. Either this would piss her off or she'd actually like telling me. I was happy with either reaction.

Instead she decided to show me, lifting her bathrobe and showing me her lower backside. Her ass cheeks were covered with purple and blue bruises. At first I was concerned, I suppose I knew I'd gone at her hard last night, but it was another thing to see the damage the morning after.

"I looked at the bruises for like a half hour in the mirror this morning Mike," she said as she dropped her robe and cooked, "It's so amazing. Thank you."

Well, I wasn't expecting that reaction. Okay, she was definitely a masochist. It's funny because she was such a pain in the butt normally, but she got off on receiving pain? Maybe there was some connection there I doubt I'll ever understand the psychology behind this. I sat there dumbfounded though at Cassie exposing this side of herself (literally and figuratively) until she served me my omelette. She took a kitchen sink approach to omelettes, it had mushrooms, bacon, cheese, onions, peppers and probably some other things, but it was all in a good proportion and tasted great.

We ate our breakfast, and she regaled me with the latest hilarious TikTok videos I had to see, celebrity gossip, and that sort of nonsense. So I told her about the latest news with my favorite football team and the big game that was coming up on Sunday.

"Bo-ring!" Cassie declared. "So you wanna go see a movie tonight?"

I suggested a superhero movie and she agreed to it. I guess that's why those movies always make a billion bucks, right? Everybody can agree on them.

I was glad Cassie would rather hang out with me than go out with her townie friends who stuck around after high school. Even if the pain pill thing was just a prank, I did think those friends were kind of druggies and not good influences on her. They actually made fun of me for "selling out" by working at a bank, but more seriously Cassie's nights out with them always seemed to involve getting plastered and high, and I knew the girls in the group were sleeping around. I just didn't want Cassie going down that path.

We got dinner at an Indian place in the same shopping center as the movie theater. I was wearing jeans and a flannel button-down shirt, since I'm a real sharp dresser obviously, while Cassie had on a matching blue skirt and crop top. It was a little too revealing for my tastes (at least for going out in public) but I'd probably have had to spank her to get her to wear something else. Which had its appeal... but I could only spank her so often.

She mostly behaved during dinner, but did pronounce everything she ordered like a midwestern yokel, which is what we both were. "You could at least try to pronounce it correctly, our waiter is Indian," I said once he was out of earshot.

"Well I ain't Indian, moron!" she said. I guess some things about Cassidy will never change.

I paid for dinner but honestly we pooled our money since most of our expenses were related to the house and we shared groceries and so on. The one thing we never bickered over was finances and that made me happy, given how many families get torn about by money arguments.

Afterward we watched the movie. It occurred to me that this was Saturday night, dinner and a movie... we were on a date. And it didn't even feel wrong. In college I hadn't really dated, I'd just tried to hook up with girls and have "friends with benefits" relationships. What guy wouldn't if he had the option, especially from age 18 to 22? But I'd never had a proper girlfriend who I actually cared about, and suddenly I was craving that warmth and stability.

Of course, my sister couldn't be my girlfriend fully. But in terms of someone to have a date night with and feel good on a Saturday, if we wanted to do dating stuff without the sex, who was to stop us? I figured that was fine if we both wanted it. So I held her hand during the movie and she didn't stop me. In fact she gave my hand a squeeze during some of the intense scenes. It felt good.

We drove home in the truck through the pitch black night. I took us the long way through a park and between two golf courses on a long winding road. She rested her head on my shoulder and without saying it, I felt like she was into being my girlfriend too. But she was still Cassie.

"Did you hear about the next super hero movie? It's gonna have a new heroine called Black Hole Girl," she said.

"I hadn't heard about that," I said dubiously, but I didn't really follow entertainment news.

"Yeah," Cassie said, pulling away from me and wiggling around in the seat, "And I'm gonna be staring as her!"

We were at the park's one stop sign so I turned to look at her. She'd turned around and was kneeling in the seat so she could pull her skirt up and her panties down as she bent over. She spread her butthole in the glow of the truck's LED lighting. "Check out Black Hole Girl!" she yelled gleefully, making me look at her butthole. It was shaved smooth and clean... no matter how many times you see your cute little sister's butthole, it still is excitingly naughty thing, even if it's just a silly prank.

"Ha ha," I said, "Cassie, your sense of humor is that of a middle school boy."

She jiggled her ass at me, not one to let modesty get in the way of a joke. Her butt cheeks were still bruised so I reached out and gave her left cheek a powerful flick with my index finger. Normally this wouldn't hurt much at all but with her bruises, she yelped in pain.

But she didn't complain. She sat down gingerly after pulling up her panties. We were still at the stop sign and she looked at me intensely. I knew she wanted me to kiss her, so I started to lean over the center console. She closed her eyes and waited eagerly.

Just then I heard a chirping electronic sound and saw flashing lights. "Move along now, kids," a tinny voice said over a loudspeaker. A cop was behind us! I felt like a complete idiot as I drove off (at exactly the speed limit).

"Geeze Cassie," I said, "You made me look like an idiot in front of the cops!"

"So?" she asked, "What do you care?"

"Well, if you must know," I said, "I was thinking about applying to be one later this fall when they're recruiting."

She laughed.

"It would be better than being a teller in a bank," I said defensively.

"Mmmm you'd be kind of hot as a cop though, wearing a uniform, carrying handcuffs and a nightstick..."

"That's inappropriate even by your standards," I said as I exited the park into our subdivision. It's not exactly a shortcut but it's a much more pleasant route than taking the main raid.

"What are you gonna do, punish me?" Cassie asked impudently. Yeah, she'll always be a brat.

The question hung in the air as I drove toward our house. I'd just spanked her the night before. Could I really punish her again? As I thought about it, I realized I wanted to do it badly. I had to accept it: I wanted to hurt a human being, for my own pleasure. I wanted to hear her cry as she was naked and powerless. But only because she wanted me to do it to her. Did that make it any more defensible though?

I looked to Cassie and she was waiting for my answer with breathless anticipation.

"Yeah, I am," I said, "For this, and for tricking me last night. I know what those pills really were now."

She gave me a guilty grin, then waited in breathless anticipating as I drove us home.

I parked the truck in back and we entered through the kitchen. We missed our parents, but sometimes it felt nice to come home to a house we owned and lived in with full privacy. We rarely had friends over so it felt like what happened with the doors closed was our own private world and no one but us would ever know what we did here.

Cassie undressed right in the kitchen. Part of me liked it better when it wasn't so obvious that she was into it, but this was much better, really. I could go a lot further if it was clear that she wanted it. She stood naked in the kitchen and I looked over her attractive body, with her perky tits and shaved twat. So many possible ways to hurt her ran through my mind, but I knew I didn't want to do any permanent damage.

"Stand there, don't move until I tell you to move," I said. She shivered in excitement. Taming my bratty sister (at least temporarily) was an intense thrill.

I grabbed two paper clamps from the junk drawer. Naively I thought maybe I'd pinch her skin somewhere but when I stood in front of her, I knew where I'd be putting them. Cassie's eyes went wide but she didn't object as I put the clamps down on her pink nipples. She gasped but I wasn't sure how painful it was. It would hurt if it was my nipples though, I think.

I walked around and looked at her ass. "I can't spank you there again yet, it's still purple," I said.

"You can whip me, or pour hot wax on me, or..."

"Shut up," I said, "I'll decide how I hurt you."

She nodded, seeming to like that I was embracing this. I pressed my hands against the clamps, driving them into her nipples deeper, and she gritted her teeth. I was careful not to touch her nipples or breasts directly, but grinding the nipple clamps into her seemed okay.

"You thought you could trick me? You're a naugty girl, Cassidy," I said. I rarely used her full name, and it made her blush now as I hurt her nipples.

"Yess," she hissed, "I'm so bad, Mike. Hurt me..." I twisted the clamps and she helped in pain. I was rock hard.

Then I had a perverse idea. I wrapped my hands around her neck. Her eyes went wide, but then she nodded. I started to choke her. I was careful not to press against her windpipe or anything that seemed like would actually damage her, and I didn't think I could choke her out like this, but I was restricting her breathing. Her face was going red as she struggled to breath.

"Choke me..." she said as best she could while gasping for her, "Choke me, Mike."

I smiled darkly. Something about her wanting it so badly, even if it was twisted, I loved it. I tightened my grip and could feel her struggling to breath, her mouth and nose making wheezing sounds as she looked at me intensely. I let go enough for her to gasp for air, then started choking again. I held longer this time and the color started to drain from her face. I knew I should let go, but she was still standing up, she had strength. I wanted to keep choking her.

I looked into her eyes and thought maybe she was getting a little scared. She wheezed badly, unable to breath now. My beloved sister, choking in my bare hands. I looked at her clamped nipples, then at her bald pussy. A bead of wetness was sliding down her thigh. Her being naked for this was so great, it was like she had no power at all. That turned us both on.

Her body started to go limp and she was struggling to stand up. I looked at her in the eyes and snarled, tightening my grip. She gasped and was trying to say "choke me" again but didn't have enough air. I looked at her naked body like I owned it. Just before she might have collapsed, I let go of her neck and she gasped violently for air underneath me, her naked body totally vulnerable.

"Fuck..." she said, "You choked me, Mike..."

"That was your punishment," I said, "Next time you upset me, I'll choke you until you pass out."

I shouldn't have added that last part on, but it turned me on so much to tell her that. I told myself it was an empty threat, just roleplaying, or something like that.

Still, I thought maybe I'd gone too far until Cassie sighed contentedly and gave me a look of love. She was eating this up. I took off the nipple clamps and saw red marks where they'd pressed deep into her. I couldn't help reach down and squeezing her ass cheeks, so sensitive from the bruises, and making her cry out in pain.

"That hurts!" she said reflexively.

"Good," I said. She looked at me again like she wanted me to kiss her. She leaned toward me.

"No, Cassie," I said, "We can't do that."

She turned away in disappointment. But if I kissed her, I was afraid that I wouldn't be able to stop myself from doing much more.

"We should end it here," I said, "Goodnight, Cassie."

I just wanted to get myself away from this situation so I didn't ravage her and do something we'd both regret. She turned and darted out of the kitchen naked, her bruised ass jiggling as she ran.

At first I told myself I'd done right. I'd given her a punishment we obviously both loved, I hadn't really hurt her, and I'd sent her on her way before we did something we'd both regret. I turned out the lights, locked the doors, set the cheap but decent home security alarm we use, and got ready for bed.

As I turned out the lights, though, I started to think about this more carefully. Cassie hadn't said anything, but I knew I'd left her hanging. In a bad way, I thought. You couldn't just make a woman feel that intense then send her to bed alone. I was feeling like I wasn't caring for her the way I needed to be. Maybe I was wrong and she'd be horribly offended by what I was about to do, but I had to take the chance.

I walked down the darkened hallway between our bedrooms, wearing just my boxers. I opened the door and walked through her unlit room and crept into her bed. She was crying softly, sniffling to make herself stop. I was right, sending her away after that had crushed her.

"Oh Mike!" she said in a voice hoarse from crying, rolling into me and draping an arm over me, "You're not leaving me alone!"

She had put on panties to sleep in but was topless, and her bare breasts pressed against my hairy chest.

"No," I said softly, "I'm here for you, Cassie. And I'll be here until you wake up in the morning."

She sighed happily and pressed her half-naked body against mine. She leaned in and we kissed on the lips. I held her to make her feel safe and she fell asleep in my arms.