My ex wife has a retarded sister.She was not physically just mentally retarted.Except for her mouth gapped open all the time and she couldnt talk she was perfectly normal.She would just poing and grunt.She was 12 when I married my wifee and my wifes grandma had passed and owned a house 3 houses down the street from my mother in law.It was decided against my better wishes that we would live there and save money to but a home later.The girl was used to just walking in when her grandma lived there so she continued. I worked mid nite shift and my mife worked day shift at a law firm 30 mile away so she didnt get home until 6 or 6 30 at night. One morning I came home from a hard nite and just went straight to bed and died I was so tiresd.At this time the girl was 13.At some point I awoke to some one getting in bed with me I always sleep n***.As I tried to figure out what was happening and wake up I heard her grunt and knew what had happened.At almost the samee time the phone rang and it was MIL wanting to know if Angie came down there I said yes I will bring her home.She said would you mind keeping her while I run to the mall.I said ok. At the same she had hold of my c*** grunting and I was getting hard.While I was on the phone she had taken her cloths off.I knew it was wronfg butI waas hard by than and got her under the covers with me and she kept grunting and playing with my c*** and bucking her hips up and down in a f****** motion.I figured out later some of the neighborhood boys had been f****** her.I started rubbing her p**** and she stopped grunting and closed her eyes and lay real still.I started shoving my finger in and found out she didnt have a hyman so she had been fucked. I decided too f*** her I spread her legs and got my c*** in the lips and started pushing she lay perfectly still and didnt make any sounds.I finally cot the head in and started f****** a little deeper un til I was up to my balls it felt so f****** good.I never even thought about condoms even though I had them and my wife and I always did. I started feeling my balls getting ready and I just blasted a load in her its was so tight that I lay there for about 5 minutes and sstarted p[umping againg and after 20 min blew a second load in her and that s when it hit me I could knock her up and got sccared when I jsrked my c*** out she pissed in the bed soaking the matress.I was paniked.I got her cleaned up and put cloths on her and stripped the bed and turnd the mattress and sprayed it with lysol. Somehow my wife didnt find out and I fucked her every chance I got but always used protection. MIL found out neighborhood boys were f****** her aand had her fixed