Undercover Infiltration Duchess

Erit, Ezet’s older sister, runs away after three years of signing a contract marriage. In the place of her runaway sister, she entered the Duke of Jaxen’s castle. Unable to afford the penalty for breaching the contract, she unintentionally pretends to be a fake wife. However, Duke Edmond Jaxen is a sadist with a tremendous desire for monopoly. At first, she was amazed by her shameful play with her husband, and now she realized that she had a masochist instinct. Source: NU Includes 7 extra chapters.