"Did you get an erection? You're the one who can take care of me!" Even though she's seven younger than me, when her parents leave the house for a few days, she pretends to be a mother and even takes care of her younger sister. Usually...

When my sister, who is usually treated like a child, is asked by her parents to "please do it while she's away," she probably develops a sense of responsibility, and despite being seven years younger than me, she acts like a mother and suddenly does housework, becomes extremely kind, and takes care of me. Her outfit is also full of eroticism, wearing clothes that show off her cleavage and panty shots! On the day I got an erection, I was shocked when I said, "You're a big brother who can take care of me," but I was so happy he started devouring my erect cock!