MUDR-107 My sister, a sex monster, fucked me for three days straight in my room before moving to an all-residential school starting this spring.

On the day when my parents left for a Buddhist memorial service, I was alone with my sister who was about to move out. Seeing her defenseless state, she who is usually smart and cute, the pride of our family, I couldn't resist my desires and ended up raping her... Then, my sister confided in me that she might have stronger sexual desires than others... From that day until the day she moved out, we had sex numerous times. This is a record of those days.