Noir Soft - Imouto Ijime

I have a little sister...She's cute. She's my cute little sister Rin.
Our parents got married and we became a family.
However... Recently I started to feel strange.
Now I feel lust for Rin.
I just see your body or touch it and I got a hard on...
Haaa... Rin... You're so cute Rin...
I think I've reached my limit...