I live with my wife and my widowed mother-in-law. My mother-in-law, Rei, is slender and very beautiful. My wife works in an office and wakes up very early in the morning. I get to work late, so my mother-in-law always wakes me up. One morning, after gently licking my morning wood, my mother-in-law turned her back to me and started masturbating. I pretended to be asleep and spent the night having sex, but...