Normally our mother is always at home, so this time was an exception. She went with our grand-mother to the clinic to make a medical exam and it would take all afternoon, so I was safe. When my sister saw me jack off in my bedroom she told she would help me if I needed but the problem is that my mom is always at home in the afternoons (she works from home) and I'm afraid to get caught in my sister's bedroom but this time was different and my sister was waiting. A few days after this my sister send me the video, I didn't know she had a camera in her bedroom and I still keep it after 10 years.