My wife has a half sister who is mentally retarted.She looks normal very cute except for her mouth gaps open all the time and her tounge is always out.She dosent talk just grunts. Me MIL had an affair with a mexican after my FIL died and got pregnant. AS soon as he found out she was pregnant he took off.This all happened befor I met my wife.The girl has black hair blacck eyes and dark skin. She is built reaally nice but skinny. She was 10 when I met my wife. My wifes grand ma had died and left her house to me wife it was three houses down a dead end street from my MIL. The little girl was used to just walking in. I worked mid nite shift and my wife worked day shift. One morning I cam home very tired and went straight to bed I always sleep n***. At this time she was arround 13 and was developing little t***. I woke up with the feeling of someone in bed with me. After I came completely out of a deep sleep I heard her grunting and realized what had happened .I jumped up and she was naked in bed with me. At the same time the phone rang and it was my MIL and she said did Angalina come down there I said I will bring her home just wait there.She said would you do me a favvor aand keep her for a couple hours while I go to the Mall? I said sure. She was laying on her back with her hand on her p**** grunting and bucking her hips in a f****** motion.I put the covers over us and put my hand down to her p**** she quit grunting and got real quite anndd started sucking her thumb, I decided to probe her p**** to see how far my finger would go in.I pushed gently and no hyman I got my middle ffinger all the way in it was tight but she definaatly was nt a virgin. I put 2 fingers in and decided to f*** her. I got between her legs and lifted her up and got the head started. I watched her for any signs of pain and saw none I just kept pressure on it and although it was very tight I was in to my balls. I knew I wouldnt last long and thought about pulling out but just couldnt and in no time emptiedd my balls in her little hispanic p****. I satyed hard and fucked her again for about 15 min and c** again. I rolled off of her and just lay there holding her little body close to mine and we fell asleep. I woke up wheen my MIL called to say she was leaving the mall. I jumped up and led her to the baathroom and cleaned her p**** up and dressed her and got dressed.When my Mil came she ask if she had been a good girl and I said she was a perfect angel. About a week later my MIL caught 2 teen boys down the street f****** her in a garage and I knew why she wasnt a virgin. I figured if she was knocked up they would be blamed for it. My wife told me her MIL had the girls tubees tied. Im the only one they trust to keep her. I have been f****** her for 2 yrs anytime they leave her with me. My wife is preg for our first child so Im going to need her more. I have tied to have her s*** me but with her teeth the way they are Im afraid she could bite. I have started f****** her anally about 3 months ago and use that when I want she dosent seem to mind