A woman who can climax from penetration is a good woman. When her body matures and she understands the taste of sex, she climaxes deeper inside than outside! She is trained by her stepson to be a sex slave. Shy housewife Yuna Shiina takes the plunge and seduces a man with her key, and Toshie Yabe is obsessed with the charms of a big dick and indulges in big dick sex. There are plenty of serious climax faces!