Mizuki, who lost her husband, lives with her daughter and son-in-law. The daughter and son-in-law welcomed Mizuki and the three of them began living together. The couple's lovemaking began as usual. Mizuki once again sneaked in and found her masturbating while watching the couple's lovemaking. The day her daughter was away on a trip. She checked on her son-in-law and found him masturbating. Mizuki pretended to enter the son-in-law's room by chance. She told the embarrassed son-in-law that it was okay and smiled kindly, asking if she could help him...