At Kyoka's request, Hisae agrees to look after her adult nephew Kazuaki. His innocent reaction to even the slightest flash of her sexuality amuses her, so when boredom strikes, she barges in while he is bathing. Ignoring his confusion, Hisae playfully strokes the cock that has gone hard from nerves and arousal. Kazuaki has never known a woman's touch, and the unfamiliar pleasure leaves him completely at her mercy until she makes him cum. But the sexually frustrated Hisae is nowhere near satisfied...