A busty older sister-in-law is caught cheating on her brother, who is single and working. The younger brother, who witnessed his sister-in-law's affair, is speechless... (Miki Yamase NGOD-248)

My brother went on another business trip to the local branch office this month... One weekend, as his younger brother, I went to my sister Miki's house to help her with some errands, since my brother and his wife weren't home... By the way, Miki is the kind of woman with an intoxicatingly large bust and voluptuous figure that makes men unable to look away... Then one day, I witnessed Miki having sex with another man...