Caught my mom.

A little about me: I'm an interracial c***d. Half black and half white. I never knew my dad. I was raised by my grandparents up until I was 13 because my mom abused d**gs and alcohol and was trying to get herself clean.
I was teased as a k** for my complexion but I never let it bother me. My grandparents taught me to be patient and kind.
Anyway, So at my 13th birthday i was told my mom had an apartment and wanted me to live with her. I was excited because I would have my own room and more privacy.
Everything went well and my mom and I bonded like mother and son should.
She would make me breakfast and walk me to the bus stop. My mother is short, white with green eyes and hits like a black woman. She had nice C-cup tits and brunette hair. I catch guys checking her out all the time. I myself have tried to get a peak at her body when she's bathing but she always locks the door and there aren't any places to hid my iPod and record her in the restroom. I confess I've tried that. I jackoff to images of my mom all the time.
Every morning that my mom walks me to tr bus stop and waits with me she always perks up when she sees the bus approaching. The bus driver, Mr Avery would talk to her every morning and wave good bye. She would smile and wave back. Just a little flirting.

This flirting went on every morning and after school. I always knew she liked him. This is where my story begins.

One afternoon school let out early but my mom wasn't at the bus stop. It didn't bother me. I walked home and noticed her car in her parking spot. I figured she was asleep so I enters the apartment quietly.
I heard noises coming from her room. I looked toward the hallway and walked closer to her room. OMG! My mom was moaning.
I instantly got a hard on. I put my stuff on the couch and walked quietly and slowly towards her room.
I got the nerve to walk closer down the hall to hear the moans better. As I got closer I could hear my mom's voice say "give me that nigger cock. Fuck my white pussy. Fuck me Avery!"
I thought to myself. It couldn't be Mr Avery. He just dropped me off and drove off on his route.
The moans and her talking like that got me so hard i started to rub my cock through my gym shorts. I heard her moan so loud "fuck yes. Fuck it deeper avery!" At that point my curiosity got the best of me and I slowly opened the door. I seen my mom on her back with her legs wide open. She had her eyes closed and head turned away from the door moaning. She was fucking her pussy with a big black dildo. I couldn't believe the sight before me! My mom was imaging fucking Mr Avery. My black bus driver as she fucked her pussy. I left the door cracked open just enough for me to enjoy the show as I jacked off right outside her bedroom. I was so hard that my cock hurt!
I guess as I was jacking off I began to moan because the next thing I know I looked up at my mom and she and I made eye contact.....