“Sperm donation”… is the act of ordinary men donating sperm to couples struggling to conceive. Tsubaki, the wife, wants to use the timing method, which has the highest pregnancy rate. She persuades her husband to have direct sex with the donor, but her frustrated, carnal body throbs and she becomes drowned in pleasure. Having something clearly different from her husband’s inserted into her, she is overcome with a pleasure she has not experienced in a long time, and she asks for sperm over and over again until she becomes pregnant…