SDMU-100 Her mother died early and her older sister had to take care of the perverted family

Her parents passed away early, so she had to take care of her two younger brothers, all the burden fell on the shoulders of her older sister, who naturally loved her younger brother, so she did everything as long as her younger brother was happy, other than that. Taking care of her two younger siblings, she had to take care of housework to earn money and especially let her younger sibling have sex to relieve her physiology. Gradually, that became her daily job. Not only that, she also entertained her friends. my younger brother