My husband was 18 years older than me, and despite strong opposition from my parents due to the age gap and his physical condition, we eloped and got married. At first, we were happy, but over time, my husband grew increasingly cold, deepening my loneliness. To cope with that emptiness, I began indulging in masturbation. One day, my stepson Kaoru accidentally saw me in the act, and we ended up becoming intimate. He treated me with genuine kindness, but I sincerely apologized to him, saying, "I'm so sorry. I don't think I can ever be a real mother to you."