A happy couple who have been married for seven years and have a good relationship. If there is one thing they are worried about, it is that the husband's ''erection'' has been bad recently... In the midst of all this, the husband suddenly proposes to her --- ''Lisa, will you cheat for me?'' He wants to film his wife being held by another man and see it. At his insistent request, the wife reluctantly agrees, saying -- ''Just once''. At the hotel where they are to meet, there is a professional ''seduction man'' requested by the husband. Lisa has no experience with anyone other than her husband. With her first stranger's cock and professional techniques, she gradually forgets about filming and becomes immersed in pleasure. After seeing this on video, the husband next asks...