The son-in-law, who lives with his mother-in-law and her husband, is obsessed with his Shizuka-in-law Shizuka's big breasts. One day, the son-in-law is tasked with being Shizuka's diet trainer. However, his eyes are glued to Shizuka's big breasts! The son-in-law is excited by the lewdness of the big breasts swaying before his eyes and attacks Shizuka! Shizuka, who was sexless, climaxes with the son-in-law's intense and powerful sex...