“Just once, I want to have sex with my mother-in-law...” Since marrying into the Yoshii family, Keisuke has been so obsessed with Miki's huge, provocative tits that he can no longer make love to his wife. Hoping to enjoy her body without sacrificing anything, he follows instructions online and makes a powerful aphrodisiac. When a rare chance leaves them alone together for days, he keeps Miki heavily drugged and repeatedly fucks her mature body with her son-in-law's cock. Before long, she starts craving Keisuke even without the aphrodisiac.