S1, E2: Nagisa suggests Shun to stay Enoshima, and Shun goes surfing with Nagisa for the first time. When Shun take off his suit, and his back has been revealed. Nagisa would be sexually aroused by the sight of it. Then he takes Shun with him to meet his girlfriend, Matsuko, for having a talk to end the relationship. What does it mean? Nagisa notices that he likes Shun...