BRD-003 Mother-son play game: son's first love, mother's downfall Mayumi Endo

I hated my mother doing aerobics. And my father, who joined in on my mother's aerobics... they're a happy couple, even though they're old enough to be adults. I didn't care about my parents. One day, the housekeeper, Sayaka-san, came to our house. I felt like she was a woman, and we had a relationship. Having gotten to know her as a woman, I began to become interested in my mother, who was close to me, and before I knew it, I was peeking at my mother's aerobics, which I had hated so much...