SAME-186 My mom remarried, and now I have an annoying younger sister, but she's super cute and mischievous. After raping her, I became a playboy. (Saito Amiri)

My mom remarried, and now we have a mischievous little sister. She pretends to be well-behaved in front of my parents, but the way she looks at me is clearly arrogant and condescending. It's so annoying, but at least she's quite cute! One morning, after everyone had left, I secretly masturbated with my sister's underwear. When she came back to get something she'd forgotten, she saw me…