True winter, the younger sister, received a proposal for partner swapping from her promiscuous older sister, Saku. She was told that her face showed clear signs of sexual frustration and that partner swapping would be the best way to relieve it. Indeed, as her sister pointed out, True Winter's relationship with her husband was far from smooth. The reason was that her husband's performance was lacking. Though confused, when she mentioned her sister's proposal to her husband, he surprisingly thought it wasn't a bad idea. Despite feeling anxious, True Winter decided to give her sister's suggestion a try...
