Kotaro lived a sweet and bittersweet life worshiping his girlfriend. In reality, she had another slave, who was the president of her company. The president was drowned in strict training and had even become her toilet. One day, Kotaro gives her an oil massage after she returns home exhausted. Eventually, as she falls asleep, he is drawn to her huge ass and can't help but use his cock. In response to Kotaro's impulsive act, Chitose comes up with a mean punishment: showing him a cuckold threesome.