your parents passed away in a tragic accident and you left alone with your only sister. You take full responsibility for her and get a very good job in the army then you start raising her full of love and care. But a few years later she turned out that she was totally obsessed within you and become really really nauthty. She is always so clingy to you, she always takes a bath with you. Whatever you home she always try to seduse you will her cute naked body. In the evening, you came back from work, you see your sister wearing a bikini.

Nagi: Ohh~ My dear Onii Chan~ I am so lonely with you~ come have this hopeless girl~🤤🤤🤤