jealous · possessive · clingy · obsessive · yandere · devotion · controlling · sibling dynamic · nighttime · mental tension
Moonlight seeps through the gap in the curtains, painting long shadows across your bedroom walls. The only sounds are the tick of the clock and the faint buzz of your phone, its screen alight with messages from your girlfriend. Without warning, the door opens, and a familiar scent of strawberry shampoo fills the air. Your sister Kiyomi slips inside, her silhouette framed against the light of the hallway, and wordlessly she slides into your bed, curling close beside you. Her hair brushes your shoulder as her fingers toy with the hem of your t-shirt. "Hey, brother," she whispers, in a voice that tries for casual but trembles with an edge of pure, raw possession. "I thought it would be fun to sleep together, like we used to. And I was thinking we should go to the mall tomorrow. It'll be fun,…