Sweet niece

My name Edward am 55 . So my little brother and his wife died in a car accident leaving their 14 year old Olivia who was mentally challenged and mute
As her guardian i had to take her in, I was staying at a two bedroom apartment, divorced with no chilld of of my own
After the funeral a sorted everything sold my brother's house and i had access to Olivia trust fund since she was mentally ill , I also got the money from the insurance, the first night we got to my place I noticed Olivia only do things when she's told eccept going to toilet, I told her to shower and go to bed, she had to sleep on my bed because the other room wasn't cleaned and I had boxes on the bed, she wore a transparent night gown no panties
I asked "olivia why aren't you wearing panties" she just looked at me, I was shocked and surprised but the thought that she'll be sleeping next to me got my 9' cock rock hard ,
As we lay in bed she started touching her pussy and her breathing changed, I tried to ignore her but I couldn't. So I moved my hand between her legs and removed her hand then I started touching her clit it was so big she started moaning loud after 2 mins of rubbing her clit she started convalsing as she had an orgasm.
After she came she lay there breathing heavily, I removerd her night gown and took off my pj's and my cock was hard i moved ontop of her and spread her legs wide and positioned my cock at her entrance I pushed my cock head in I struggled for few sec and the head popped in she was so tight then with powerful thrush pushed all the way in i could feel her virginity brake I couldn't help but yelp ant the feeling " aaaah baby so tight" she screamed I didn't care all I could think of was making her my woman her pussy was so warm I stayed in her for 5 mins without moving to let her adjust to my thick cock, I sucked her breast and started pying with her clit she started moving her hips I knew she was ready I fucked her slow at first then picked up the pace, the thought that I can fuck her pussy and even get her pregnant made me go wild, I removed my cock I can tell she wasn't happy about it, but I wasn't done i put the pillow under her bum ŕto lift her up then I put her legs over my shoulders to make sure I go straight for her young womb, I fucked her hard and deep she wa making noise of pleasure then I came as the tip of my cock kept going deeper my balls tighten I couldn't help but deposit a load of cum deep in her womb
I stayed inside her to make sure nothing drops out
I whispered in her ears "Olivia you're my wife now" she was holding me tight I started kissing her lips with my tongue in her mouth, after 10 mis I got hard agoin I was still buried inside her cunt I started fucking her again that night night I fucked her 4 times and made sure I cum in her little pussy , my pussy i sure as hell wasn't gonna let let any man near that pussy it was mine and mine alone
It became out day and night routine we fucked like rabbits since Olivia moved in with me I've never seen her periods 2 months later she started feeling sick I took her to the doctor it was confirmed she was carrying triplets,
When i got home I started making plans to move to the country site with my pregnant Olivia, away from prying eyes I contacted an estate agent bought a farm when Olivia was 5 months we moved to our new home I fucked Olivia through out her pregnancy I couldn't get enough of her pregnant pussy she loved fucking I realize I created a cock monster, nine months later she gave birth to 2 boys and 1 girl they were born healthy with no defects.