"Sperm Provision" .... This was a solution for couples struggling with in vitro fertilization, where general men provide sperm. Ayaka-san is such a wife who desired this act, a sexual encounter done at specific timing for providing sperm, but the husband had believed that it was merely a righteous assignment without affection, anyway .. But opposition to the husband's desire ... It was utterly corrupted by her relationship with the sperm provider, slowly becoming a depraved mistress who endlessly craved for sperm. Even now ....