人妻天国2 ～繁殖マンション、人妻の子宮を子種で満たす～

Just as he was growing impatient, unable to find a suitable target, a couple moved into his hunting ground. Daisuke was intensely drawn to the stunningly beautiful, picture-perfect married woman, Kasumi Terauchi. He set her as his target, approaching her as both the building's owner and a fellow resident. With smooth talk, he coaxed her into confiding her troubles. Learning she longed for a child but her husband refused to let her get pregnant, Daisuke timed his moves for the daytime hours when her husband was out working.

He succeeded in having a physical relationship with her, exploiting the gap in her heart that yearned for a child.

Daisuke was thoroughly satisfied with his daily routine of exploiting Kasumi's vulnerability—the weakness stemming from their physical connection—to ravage her body. But some time after ensnaring Kasumi, another couple moved into the apartment complex that served as his hunting ground.

The new married woman's name was Mimori Yazaki. Daisuke, drawn to her mature body honed by ten years as a housewife just as he had been to Kasumi, approached Mimori using the same tactics to gain her trust. He learned she was troubled by infertility. Discovering his desire to impregnate Mimori just as he had wanted to impregnate Kasumi, Daisuke hesitated not a moment. He plotted to impregnate her too, to make her carry his child.

He successfully exploits the emotional vulnerability of Mimori, who struggles with infertility and a sexless marriage, to initiate a physical relationship.

Both Kasumi and Mimori recognize that continuing their physical relationship with the protagonist is a betrayal of their husbands, yet they persist in their affair before the pleasure Daisuke provides. Daisuke makes effective use of the time when their husbands are absent, relentlessly repeating insemination sex.

Kasumi Terauchi, a newlywed wife married for only half a year. Mimori Yazaki, a mature, experienced housewife who has been unable to conceive.
Faced with Daisuke's sex—his penis far more virile and robust than their husbands', his powerful vitality—the two married women gradually succumb to pleasure, eventually welcoming Daisuke's impregnation with delight.

[Translated from official site]