Because Hinata's husband is much older, the two always consider each other as siblings. Hayato often comes to eat at Hinata's house three times a week. However, Hayato's true intention was not simply to eat with his "brother". He had always had feelings for Hinata, but she never realized this. Once accidentally asked if Hayato had a girlfriend, Hayato mustered up the courage to confess to her. Hinata just thought Hayato was joking and wanted to get this over with. A few days later, when he went to get documents from Hinata, Hayato suddenly attacked her. Even though Hinata was resisting, Hayato still realized that she was enjoying this immensely. And just as he thought, this was the first time Hinata lied to her husband. If she told the truth, everything with Hayato would end, but somehow she couldn't do that herself. And so, she continuously let Hayato fuck her, even Hinata herself actively sought him out. Her husband was also suspicious, but because Hinata kept lying, as well as because he trusted his wife too much, that "traitorous couple" continued to have an affair right behind his back...
