KSBJ-050 Mother-in-law Chisato Shoda drowns in play with her son-in-law

My mother-in-law, Chisato, is 48 years old. - Chisato-san, who lost her husband three years ago and became a widow, takes care of my husband and I every day, even though she has no choice but to take care of her voluptuous body. - My wife is currently pregnant, and I'm feeling frustrated, so I've started to see my mother-in-law, who isn't much older than me, as a sexual object. - One day, I witnessed my stepmother masturbating in the bathroom...