Sister sleeping

My father has just got married, after so many years a widower. In my opinion it was not necessary. Why get married after retirement? And also, the package comes with a half sister. But I’ll be honest, when I saw it, I changed my mind. It has my age and she has an awesome body. At night I go in his room and I look at sleep. You may think that you are a pervert, but I assure you that you would do the same if I were in me. One night, I exceeded the limit, he was half naked and wanted to touch it a bit, but when I started I couldn’t stop. Woke up this morning, and I had to cover her mouth to keep her from screaming. Was a little frightened, but when he realized how good I sucked her pussy stop.