One day, Naoya, who had a crush on his friend's mother, Shiori, witnesses the sight of his admired Shiori embracing a young man, their tongues entangled. The woman he admires licks the man's penis while drooling... Later, when Naoya visits his friend's house, he confesses to Shiori about it. "Naoya, you were watching..."Shiori, who has been found out about the sexual act, gropes Naoya's crotch, and her seductive lips come closer to Naoya...