Hikari's husband lost his parents in an accident, when he was very young. His older brother struggled to raise his younger brother alone until he grew up, and Hikari's husband was extremely grateful to him. And then one day he and his wife visited his brother's house, the older brother seemed fascinated by Hikari's beauty and told his brother that he wanted to sleep with his wife for one night. There was no other way when he was so indebted to him, the other husband could only quietly watch his wife being fucked by his brother in pleasure behind the curtain.
