Last winter, Shota's dad remarried. The woman he married was a beautiful and busty woman named Rika. Although Shota couldn't get used to his stepmother Rika, one day a friend envied him saying that Shota's mom was beautiful with huge breasts, and Shota gradually started to see Rika differently. Eventually, he ended up masturbating using Rika's photos. Later, Rika bathed with Shota and saw his grown penis… She appeared in Shota's bed again, urging him to do it once more. Unable to hold back anymore, Shota secretly did all sorts of H activities behind his dad's back.
