I Am A 'lapdog Asshole' Who Is Tamed By My Husband's Younger Boss. Ryo Aiyumi

Five years after marrying her husband Tetsugaku, who works in sales at the same company. Ryo was living a modest but happy life. Then one day, while Tetsugaku was away on business, his boss Saji visited and told her, "Tetsugaku made a major mistake at work, causing huge losses to the company"!? Saji tries to force a slave contract on the bewildered Ryo. For the sake of her husband, Ryo offers her body, but the anal sensitivity training that began that day brings her pleasure and shame she had never experienced before... Gradually, her reason is eroded, and Ryo climaxes repeatedly with her anus gaping open...