HUNTC-465 Diary of Oral Sex With My Sister, Kept Secret From Parents - Obedient Sister Trained to Give Blowjobs

A man writes in his diary about the oral sex his sister gives him, hidden from their parents. He taught her from childhood that it was normal between siblings, and she still believes it. Her skill improves daily, and recently she has started doing it in places where their parents could catch them. The risk of being discovered makes it more exciting, and they end up crossing the line.