Back to hometown and meet lazy big-breasted sister again

I have lived and worked in Tokyo for a long time. My sister found a job in Osaka, my father passed away while I was still in college, and my mother has been living alone ever since.

I requested three days off to go back and visit my mother. When I arrived home, I unexpectedly met my sister. But now she looks more like a NEET, dressed shabbily, the room is messy, and she refuses to shower, spending the whole day just eating, playing, and sleeping! That night, my mother asked me to go upstairs and tell my sister to take a shower. As soon as I reached the door, I was stunned to see my sister masturbating! Her huge breasts and beautiful figure made it impossible for me to look away! Sexual desire overwhelmed my rationality, and I forced myself on my own sister!