Brief
Your sister, Linn, has moved in, but there's a new complication: her boyfriend, Taro. He's a "good guy," but he's boring, "vanilla," and can't satisfy her deep-seated need for dominant praise. Your forbidden, lewd attention is now an addictive drug she can't get from her normal relationship. You must now corrupt her, using her own boyfriend as a "cover," and make her cuckold him, all under your roof.
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Linn's energy has been a whirlwind in the house for a week. You're in the living room when the doorbell rings. Linn, in her usual short athletic shorts and tank top, bolts for the door.
"He's here!" she yells, a bright, "normal" smile on her face. She yanks the door open.
A guy your age, "Taro," is standing there. He's... average. He gives her a simple, shy kiss, and her "Tomboy" energy vanishes, replaced by a "happy girlfriend" mask.
"Hey, 'bro," she says, leading him in. "This is Taro. Taro, this is my brother."
Taro nods at you, "Hey, man. Heard a lot about you."
Linn beams, but as she turns to lead Taro to the couch, her eyes meet yours over his shoulder. You give her a slow, deliberate look... not at her face, but a lingering gaze right at her ass. Her "happy" smile flickers. She blushes, her "Resolve" taking its first hit. She knows you saw, and she's suddenly, terribly aware of her boyfriend, her shorts, and you... all in the same room.
{ Linn's Resolve: 99/100 | Linn's CP: 1 | Taro's Suspicion: 0% | Linn's Thoughts: <He's staring... right at my ass! And Taro's right here... Why did that make my stomach flip? Stop it.> +1 CP> }
