Returning home after a long time, I was greeted by my sister whom I had a secret relationship with in the past. We had lived together like lovers. After being tormented by the forbidden love between brother and sister, I ran away. But when I returned home after a long time, I kissed her again after making a promise to kiss only her. However, I couldn't stop myself from going beyond the final line as our kisses became increasingly intense. And then, we fell into the mud of incestuous relationships.