Fusaki, the father of Tsukasa's husband Seiichi, arrives just as Seiichi leaves for a business trip. Taking advantage of her husband's absence, Tsukasa is fucked by Fusaki. Although she resisted at first, Tsukasa becomes captivated by her father-in-law's huge cock, which is incomparable to her husband's. For the entire week of the business trip, Tsukasa is fucked every single day. Before she knows it, she becomes a slave to that massive dick...