The old man, despite his old age, still has a strong desire for sexual relationships and appears to be very energetic. His wife passed away early, so he has not been with any woman for a long time. He often experiences intense emotions and extreme arousal since his son married a young, beautiful, and attractive wife. He yearns to have sex with his daughter-in-law once, and he feels that if this happens, he will be satisfied for the rest of his life. He often secretly watches his daughter-in-law bathe, and each time he does, his penis becomes erect. He only wants to passionately have sex with his son's young and beautiful wife. He is fortunate to discover that his daughter-in-law is also very promiscuous and enjoys sexual activities...