JUQ-315 My boyfriend's sister is really promiscuous.

This is a secret memory that can never be forgotten. Koichi, my husband's best friend, came to our house during a business trip. Koichi, who is five years older than my husband, is like a brother to him. I felt happy seeing my husband, who was joyfully reunited after a long time with a bright smile on his face. However, I was attracted to Mr. Koichi's charm as a man, which my husband does not have. The more I think it is useless, the more I cannot suppress my burning desire...