Yoji returns to his parents' home, but his brother and his wife seem to be having a bit of a rift...it seems like they're having trouble over the policy of infertility treatment. Yoji kept his distance, but by chance he spied on his brother and his wife's activities... He can't take his eyes off the lewd appearance of his normally docile brother-in-law, and Ai notices it. Ai, who desperately wants to become pregnant, seduces Yoji by offering her brother's sperm. Drenched in sweat, Yoji is swayed by his sister-in-law's lewd behavior as she urges him to ejaculate over and over again, and finally releases a large amount of semen into her vagina... *The contents may differ depending on the distribution method. Special feature