It's my 21st birthday and finally time for me to learn the family secret, the reason me and my sisters were born. You wake me up and chat to me about the day and spy on me while I get changed ready for my birthday. You invite me into your room, and begin to tell me my purpose, to be bred and impregnated. I strip for you nervously but do as you say, I know my daddy only wants what is best for me and would always keep me safe. I take your trousers off exposing your throbbing cock, getting my pussy wet for you before you put your seed inside me.