NATR-453 sister-in-law Rei

Half a year ago my brother got married, and my wife got married to our house. My brother-in-law is one year older than me and is very sexy, friendly and bright. But I have a problem... My sister-in-law's sexy underwear is in the laundry. It's stimulating for me, who has nothing to do with sexy underwear, and while remembering my sister-in-law... One day, I found out about my sister-in-law's hidden secret that even my brother didn't know...