A needy mother secretly cheats on her son while her husband is away on business

My father is scheduled to go on a long-term business trip next week for trade-related work, and my mother is very sad because of the business trip, but “Tadashi” Her son always anticipated this moment. “But”, who had long been aware that his mother was the opposite sex, enjoyed life alone while peeping at his mother's naked body and voyeuristically. Tadashi sneaked a look at his lonely mother crying in the middle of the night and decided to seriously support Kana like a man.