"Oh my, sister-in-law. Thank you for everything." Osamu was Kokoro grateful to his sister-in-law Kaori for not only cleaning up his messy room after his wife went on a trip, but also for cooking him dinner. He was unaware that Kaori was grinning as she looked at him like that. "Osamu-san, can I stay over tonight?" Osamu readily agreed to Kaori's request, but he had no idea that Kaori's goal was to have sex with Osamu...