Since childhood, he had secretly harbored romantic feelings for his aunt, Eri. As the years passed, those emotions grew deeper, eventually transforming into uncontrollable lust. Though he wanted to keep it hidden from everyone, one day he crept toward the bathroom. There, he saw Eri masturbating inside the bathtub. Surrounded by steam, her body twitched in lewd, convulsive motions. The erotic sight of her soft, glistening skin overwhelmed his senses and shattered his restraint, causing his suppressed desires to burst forth uncontrollably.