by Writing Shark

You conquer your sister
You’re sitting in your room when you hear the door downstairs open. Cathy actually hurried back home, but wasn’t fast enough to keep your anger at her blazing. That’s the thing girls like Cathy are good at. Men are quick to forgive.
But girls like Cathy also have their weaknesses that come from the same advantages they gain their strengths from. Your sister has also had enough time and has calmed down a bit. You briefly hear your stepmother ask what’s going on, but Cathy is already rushing up the stairs to your room. She appears with an expression that immediately kicks your friendly one in the bud.
“What the hell was that all about?” she snaps at you, more confused than angry, but no longer fearful. “You stupid asshole!” And when she realizes she can insult you, she does just that. “You son of a bitch! I’ll slaughter you, you little asshole!” She charges at you with her face flushed with rage.
But you’ve changed.
The slam of your hand on her face seems deafening and her head snaps around, her hair flying as she gets on her knees in front of you. She’s older than you. She’s more confident than you. She has more experience than you. But you are a man. You have more power than she does. And for once in your life, you use that power. For once, you enjoy the freedom to assert yourself before you put her in chains forever.
“First, a few ground rules,” you say, rushing up to her, grabbing her by the arm and tossing her onto your bed. Her heavy breasts jiggle under her tight white top. This whore has no bra underneath! Bitch! Cathy holds her aching cheek and tries to get up.
“Stay down!” you command but Cathy disobeys. She swings to her feet, murder in her eyes, and wants to rush at you.
It’s like you fired a taser at her. Her whole body suddenly tenses up, her mouth pops open, and she starts twitching wildly. Then she just falls over, rolling on the floor, jerking her arms wildly and convulsing. You grab her again and throw her face-first hard onto the bed. Immediately her body goes limp. At first, nothing happens, then she screams dully and painfully into the sheets. You are glad that the fabric muffles her panicked voice.
You wait a minute, then your big sister stirs. Exhausted, she turns her face to you, wet and red and fearful.
“First, a few ground rules,” you repeat as if talking to a petulant child. Cathy stares at you with wide eyes. “You’re right about me being responsible for what happens to you.” You grin meanly. “Well, almost, anyway. You brought the pain on yourself.”
“What…”
“Shut up.”
“Ethan what…” Again she spasms painfully for several seconds. While her body is filled with pain, you sit down next to her. From now on, you don’t have to be afraid of her.
“What you have in your neck I call the Mind Spear. It is a kind of self-sustaining, self-expanding mechanical parasite. It’s planted in the central nerve bundle on your spine. Don’t worry, it’s invasive but not harmful.” Another grin. “As long as you don’t resist me. Get the picture? The Spear hijacks your body’s chemical-electrical signals. That means it will harm you if your body doesn’t do what your brain tells it to do. Like some kind of road control.” Cathy looks at you in panic. Her mouth drops open, but this time she doesn’t say a word. “Right,” you grin, “I told you not to speak, and you’re complying. So no pain. Well, I can’t control what you do or think. Your head is all yours. For now. But I can make your brain interpret my words as the primary signals. This is actually quite simple. Think of the imprinting of baby birds on their mother.” Cathy squirms in pain and moans loudly. You pat her hot body. “You have to think that now, or your brain will punish you for not obeying me.” And sure enough, Cathy relaxes again. “See? From now on, your brain controls you and I control your brain. It’s hard to believe, I know. But we have enough time for me to prove it to you.”
Your sister looks at you out of those big eyes you used to like, the ones you looked up to. Not anymore. Now she stares up at you, fearful, nervous and confused like a silly little girl.
“So the ground rules,” you say, unable to stifle a happy grin. “Rule one. You don’t do anything that directly or indirectly harms me. Got it? You may speak again.” Cathy stares at you, stunned. “You should answer me. Your body will punish you otherwise.” And indeed, your sister immediately feels her belly. Interested, you realize that there seems to be a difference in how her body reacts to your words. “It seems that the pain can increase slowly or manifest itself in a strong attack. It’s funny. You know even when you do something I don’t like and your body reacts to it. So no more stupid attacks on me, got it?”
“I get it,” Cathy says quietly without looking at you.
“Rule two. You already know it but I’m making it official. You do everything I tell you to do and fulfill my orders to the best of your ability. So no half-measures because you think you can screw with me.”
“I understand.” And this time she says it because she knows you want to hear it and it’s true.
“Rule three. This one is for you. You don’t do anything that directly or indirectly harms you.” She looks up at you in her bemused gratitude but you shake your head. “Unless I command you to. My orders are above all else.”
“Yes.” Then she winces. “I understand.” A tear trickles down her cheek but you’re still not done.
“Rule four, you don’t tell anyone about the Mind Spear or what I did to you. It’ll be our little secret.”
“Yes. I understand.”
“And rule five, that’s all I have at the moment, but that covers the basics. You don’t lie to me anymore. Simple as that.”
“Yes. I won’t lie to you anymore.”
“Good,” you say, satisfied. Then you get up and walk around your room. You think about it for a moment, but realize that you have no doubts. You turn to Cathy. “You are mine now, sister. But before I can be sure…” Here comes the best part. “Before that, I have to test you.”