Me and my sister shared same room. So every time when she watched TV, I would masturbate under blankets. Onetime she caught me. I was scared and embarrassed, But she wasn’t shocked and told me that she knew that I masturbated from the first time. I don’t know what happened to her that time she was stroking me and literally she asked whether she can suck my dick. Still I was shocked but nodded yes. She said that we could fuck if I kept silent. It was great pleasure. From that day our incest continued.