I reluctantly went out with my sister who had just been dumped by her boyfriend, and we ended up drinking until she passed out. When I woke up, she was also sleeping unguardedly, and I got excited seeing her panties under her skirt. I started masturbating using her as a visual aid, but she woke up midway, making the atmosphere instantly awkward. Unable to bear this situation, when I tried to leave the room, my sister offered to help me with the masturbation！！
