NACT-078 Yuki Wakaba, a wife, is seduced by her husband's colleague after he sees her being trained

The narrator stays at the home of a senior colleague he has not seen in years. Late at night, he witnesses the colleague training his wife, Yuki Wakaba, in a sexual ritual. The next morning, the colleague is gone, and the wife behaves seductively toward the narrator, touching him and giving him meaningful looks. He gives in to her advances, unaware that the husband and wife planned the entire encounter.