SPRD-1010 - Satisfied? Not with my husband: Swapping wives for a better taste

Ryoko and Nanako are tired of their husbands' lackluster performance in bed. Deciding to take matters into their own hands, they secretly swap partners under the guise of medical check-ups. What starts as a clinical examination quickly turns into a steamy affair, as they discover exactly what they've been missing in the arms of another man.