Dad rarely comes home from work, so there are only two mother and son in a big house. Hen, the son, has reached the age of puberty, so sex is the thing he thinks about most in his head. He starts watching porn to masturbate and is curious about the women around him, with his mother Yokoyama being the one he pays the most attention to because she is always by his side. Surprisingly, one morning, Hen couldn't resist his urge, he approached the beautiful young mother with big round breasts and buttocks and started...