Yomeshuutome Rezu Choukyou ~Giri no Oyako ga Kanaderu Hen'ai Kyousoukyoku~

Original title: 嫁姑レズ調教 ～義理の親子が奏でる偏愛協奏曲～

After my father-in-law passed away, worried about my mother-in-law who was now alone, my husband and I decided the three of us should live together. I thought we would get along well, but she started making constant comments about my housework, and before I knew it, a subtle power dynamic had developed between us. Then one day, she ordered me to play the piano, calling me clumsy. As she taught me from behind, placing her hands over mine, I began to feel an uncomfortable and unnatural closeness from my mother-in-law...