It's been a week since my wife returned home to give birth. While enjoying his long-awaited solo life, Kaho, my wife's sister, came to help with housework. Every time she cleans, Eita can't help but get an erection when he sees Kaho's tanned body with dazzling tan lines. If this continues, I'll make a mistake. Desperately gathering his reason and trying to maintain his composure, Kaho reaches for his crotch as if mocking him…