I have an older sister who is much older than me. Her name is Ami. My sister is really troublesome. She doesn't have any sense of chastity... At home, she's always panty-less and bra-less. Her nipples are always visible, and she's always thinking about lewd things. She's doing obscene masturbation in the living room even though I'm there. Moreover, she steals my underwear! Even when I scold her, she pretends not to know... "Forget about that, let's get naughty!" she tempts. A strange story of a day filled with naughtiness while our parents were away.