Half a year ago, my brother got married and his wife came to live with us. My sister-in-law is the same age as me and very sexy. She's friendly and cheerful, and she works hard at being a housewife. However, there's something troubling... It's finding her sexy underwear in the laundry. This is stimulating for me, and I often masturbate while thinking about it. Then, by chance, I came to know her secret…
