I'm a ronin student who lives like a free-roam in his brother's apartment. He had an unscrupulous feeling towards a woman's body.One day, my brother went on a business trip to the countryside for two nights and three days.72 hours alone with my sister-in-law.I exploded the emotions I had been putting up with until then, and during the three days when my brother was away, I spared no time to sleep and had sex with my brother's wife.