Big brother's wife

Kohei decides to stay at his older brother and his wife's house for a while as a job hunt. There was Saya, the brother's wife whom he had always loved for. Kohei began job hunting the next day, but it didn't go well, and he was also hit by Saya, who encouraged him, and he had enough momentum to steal his lips. Unable to bear the awkwardness, Kohei apologizes, and it has been a while since Saya felt the woman's ache and couldn't help but seek him out. Saya, who has become obsessed with love for Kohei, who is obsessed with him, and enjoys the pleasure herself, makes a promise with Kohei...