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Chapter 1: The Tactical Resolution to Dysfunction The narrative begins shortly after the wedding of Yuto and Sae Okumura, depicting what appears to be an ideal honeymoon phase. However, their domestic life faces an immediate crisis due to Yuto’s inability to maintain an erection or reach climax during intercourse with Sae alone. Confronted by Sae’s concern, Yuto reluctantly discloses his underlying condition: a deep-seated preference for group sex with multiple large-breasted partners, without which his physical reflex cannot function. Rather than reacting with anger or ending the marriage, Sae treats the situation as a logistical problem requiring a practical intervention. Driven by her desire to conceive a child, Sae contacts her trusted friend Emi Fujiwara, who meets Yuto's physical criteria and lacks sexual experience. Sae invites Emi to their home and proposes a wife-approved threesome. Although Yuto initially expresses hesitation out of concern for social decorum and Emi's well-being, his psychological inhibitions are overcome when confronted by the physical presence of both women. The resulting encounter resolves Yuto's dysfunction, leading to Emi losing her virginity and enabling the necessary intimacy for Sae's childbearing ambitions. and the Hot Spring Retreat The second chapter addresses the practical and emotional logistics of maintaining a recurring multi-partner arrangement. Recognizing that casual visits are insufficient for long-term consistency, Sae facilitates Emi’s relocation into the apartment directly adjacent to the couple's home. This spatial proximity integrates Emi into their daily routine, transforming their sexual encounters into a regular domestic practice. As Emi develops genuine affection for Yuto, subtle anxieties arise regarding boundary enforcement and potential emotional friction between the two women. To reinforce their interpersonal trust and secure a secluded environment, the trio books a trip to a private hot spring resort. Occupying a completely reserved inn, they engage in prolonged intimate activities across the hot spring facilities, including soap play and communal baths. The resort environment removes external social pressures, converting potential romantic competition into mutual bonding between Sae and Emi, thereby stabilizing the triad's emotional foundation. The third chapter shifts focus toward long-term relational security and the fulfillment of the couple's original objective: pregnancy. As the triad settles into a comfortable rhythm, an underlying concern develops among all three participants. They fear that once Sae achieves pregnancy, the underlying rationale for the dynamic will end, dissolving their shared lifestyle. To address this concern, Sae and Emi hold a private conversation without Yuto. Recognizing that their bond has evolved beyond a temporary clinical remedy into a permanent emotional connection, Sae proposes that Emi formally join the household as a co-equal spouse. Under this agreement, Emi is also encouraged to conceive Yuto's children, cementing a joint-motherhood framework. During an extended holiday period, Sae presents this plan to Yuto. The chapter culminates in an intensive, week-long effort dedicated to impregnating both women, finalizing their transformation into a permanent, multi-wife family structure.