In order to protect his father's assets from his younger brothers, the eldest son has his wife, Shiori, take care of his father. Shiori is tricked by her father-in-law's fake illness and takes care of him diligently. She can't refuse his request and even gives him a handjob. She swallows her saliva on her father-in-law's impressive cock. And so a secret physical relationship begins. The third son sees her and threatens to commit adultery. She climaxes over and over again with the huge cock he inherited from his father. The slutty wife reveals her true nature in a threesome with the second son and father-in-law.