"Sperm Donation" is an act where a regular man donates his sperm to help couples struggling with fertility. This time, a couple married for two years appears. Since they traveled all the way from Miyazaki, Sana decided to engage in direct sexual activity with the donor after consulting with her husband, thinking, "Since we're here, why not..." However, the pre-intercourse massage ignites her lust. She ends up initiating sex herself, succumbing to the intense pleasure that builds with each thrust of her hips.