BittersweetMaki runs a small store with her mother. One day, her life was disrupted as her father debtors came. She was forced to marry Kame, the head of organization's son, who did not want to inherit the organization cos of his past. Yamapi is the half-brother of Kame, he was not welcome in the house. He met Maki after she became his sister-in-law. Maki was similar to Yamapi, unwelcome and uncared for. Yamapi endeared himself to Maki and Maki had only Yamapi to rely on in the family. Soon they fell secretly in love. Neither one could speak of their love for each other because of their status. Yamapi could not bear to see Maki suffer in the household, so he decided that he would do anything to get her out of the household. But he knew somewhere deep in his heart, there was a selfish reason. He wanted her.
Fanfic: http://www.winglin.net/fanfic/Bittersweet/