One month before a family hot-spring trip, his in-laws unexpectedly ask Kyo to abstain from sex so he can help make them a grandchild during the vacation. He follows their request, but the pent-up desire becomes unbearable. Hoping a soak will calm him down, he accidentally enters the women's bath and sees his mother-in-law's sensuous naked body. Losing control, he spends the overnight trip repeatedly creampieing her—and is left terrified that he may have impregnated his wife's mother...