Sister-In-Law is too Irresistible

Summary: Several years ago, Tsutomu’s parents ran a flower shop. He now lives with Mai, his older brother’s wife, who runs the business. Mai is left alone now that Tsutomu’s brother has moved away, and Tsutomu helps her run the flower shop. While Tsutomu’s brother is away, Mai feels very lonely, so Tsutomu supports her and satisfies her during this time. Mai’s friend and senpai Kozue was recently hired as a part-time worker. Due to her husband’s rarely being home, Kozue envies Tsutomu and Mai’s relationship. As these three indulge their desires and feelings, what will happen?.