START-233: Foreign Financial Worker Brother Returns Home for New Year's Holiday and Secretly Fucks His Sister Working at a Local Cell Phone Shop in the Bathroom at Their Parents' House - Amatsuka Ten

The story follows a brother working at a foreign financial firm who returns to his rural hometown for the Lunar New Year holiday, reuniting with his sister who works at a local mobile phone shop. With their parents at home, the two cannot suppress their forbidden desires and secretly engage in intense sex in the bathroom, savoring the thrill and pleasure of their intimate encounter.