Mariko comes to Tokyo from my wife's hometown to care for her during pregnancy. My marriage seems happy until asking my pregnant wife for sex causes a bitter argument and she orders me to abstain completely. One day, Mariko takes pity on my listless state and gives me a massage. The sight of her exposed cleavage makes me hard, and when she notices, she gives me a seductive look and asks, “Would you like me to massage this too?” Her forbidden offer leads us somewhere neither of us should go...