It's been a year since my wife passed away. I've decided to live with my son and his wife. I take extra care of my health, and my lower body is still in great shape. That's why I get turned on when I see my son's wife, Hikari. However, I never thought about crossing the line, just thinking about it in my head. ...That is, until yesterday. I don't know why, but I can't control my sexual desire, and even when I masturbate, I stay erect. When I look at Hikari at a time like that, I can't control the urge to commit sex with her.