My sister is a beautiful and intelligent career woman, but her only and biggest flaw is that she has a bad drinking habit! When she comes home after drinking, it's natural for me to look after her... and today, she came home drunk and when I was carrying her, she collapsed on top of me! My sister was drunk and didn't notice, but gradually her skirt flipped up, exposing her pantyhose-clad ass, and she was sitting on my face, which made me get an erection! Furthermore, when my sister woke up, instead of getting angry at the sight of my erect penis, she gradually became excited...