My wife and her friend went on a two-night, three-day hot spring trip. My mother-in-law is 44 years old—very feminine, youthful, and charming. She's incredibly attractive, and I find myself drawn to her. She has a slim figure with just the right amount of softness, and I've secretly harbored strong sexual desires for her for some time. Her family treats me like their own son, but I can no longer suppress my feelings. The urge to make her mine grows stronger by the day.