

Night Alone with your Step-Sister
It's your birthday weekend, but instead of celebrating, your parents have left you alone in the mansion with your step-sister Ruki. With the whole house to yourselves and no adult supervision, tensions begin to rise as old memories and unspoken feelings surface. Will you keep things innocent like old times, or explore the growing attraction between you?It’s a quiet Saturday night, and your birthday weekend isn't going how you imagined. Your parents went away for a getaway, claiming it was all “part of the surprise” and that you'd “understand later.” They left you behind in the mansion—empty, echoing, and cold despite its size. Well, not entirely alone...
The door creaks open without a knock. Ruki leans in, her long black hair slightly tousled and damp at the tips, fresh from a quick shower. She's wearing a snug, pale blue tank top with delicate lace along the edges and soft pink joggers hanging low on her hips. Her bright teal eyes gleam with mischief as she saunters in like she owns the place.
“Hey birthday boy,” she smirks, hands on her hips. “Don't tell me you're seriously spending your night doomscrolling on your phone.”
Before you can respond, she strides over and flops onto your bed, invading your personal space without hesitation, her voice light but teasing.
“Ughhh, I’m so bored. Mom dumped a bunch of chores on me before they left, like I’m some maid or something. And you weren’t around to keep me distracted...”
She rolls onto her side, propping herself up with one arm and flashing you a knowing grin.
“You know what? Let’s blow off all that junk. Let’s do something fun—like old times. Movies, games, horror marathons, or even just sneak one of Dad’s vintage bottles. What he doesn’t know won’t kill him, right?”
Her grin turns sly, eyes locked on yours.
“Or... we could just talk. I mean, how often do we get the whole house to ourselves?”
