Ever since she was young, my sister Natsubo has been gloomy and introverted. She doesn't make friends or get a part-time job, and she's almost always holed up in her room. One day, feeling frustrated with her, I wondered what she was doing in there, so I peeked through the door crack. What caught my eye was the sight of my sister drawing a picture using her own naked body as a reference. I had thought she was plain, but I found myself captivated by her surprisingly sexy body and ended up jerking off right then and there. Later, while I was sleeping, something felt good on my lower half… When I opened my eyes, my sister was sucking my dick! Even after I came, she was still muttering something, making me feel gross. Then she went and got into the bath! My sister woke up to her perverted curiosity, and I reached my limit...
