I was in my study room, making a project on my laptop. Dat night, i was a 13 years old boy. I was cute and small. That night my father was out for his meeting next morning. I and my mother were alone in the house. While i was completing my project, i heard my mother make a phone call to someone and asking that person to come to our house. I didn't took it seriously and to not get disturbed, i close my study room's door. After 3 hours, i was just about to complete my work and thought of taking my dinner. It was about 10 pm. Just before i was ready to turn off my laptop, i heard our bell ring. When i saw out through the window, i saw a man. He was wearing a half shirt, his skin was brown, he must have be 30 year old and he had six packs. His arms looked big and strong. My mother opened the door. I thought of practiceing a few maths before i go for dinner and thus i stayed in my room with the door closed. After about half an hour, my mother called me. I walked to the door, opened the door and as i saw my mother, i was totally shocked. My mother who was 29 years old that night was sitting on her knees in front of that man. She was only wearing a pair of shocks and a panty. Her bra was taken out even before i came there and i saw that brown coloured, tall and strong man throw my mother's bra in a couch. As i walked towards my mother, she gave me a wicked smile and started teasing me by playing with her breasts in a naughty way. When i asked her what was going on, she introduced that man as my step father for that night. I felt really unsecure and scared. That man was my mother's boyfriend in back of my real father. He stayed in the northern part of Canada. I and my mother as well as my father lived in the north eastern part of Canada thus his house was quite close to us. Soon that man caught my mom and made her lay down in the ground. Then he started making my mother lick his leg and my mother did it very well. His name was Johnas Jack Watson. As my mother licked his leg, he took his shirt off. I for the first time now saw his body which seemed really strong without any fat. Then he took off his pants as well. He was not wearing any underwear as i suspected. He then sat on my mother's face and made her lick his dirty black anus. As my mother did it, i say his penis. His penis was very long as well as very thick. It most probably was 18 cm long and 10 cm in breadth. It was totally black in colour and seemed really dirty with water coming out of it. It smelt very bad too. I was standing about two meters away from them and still i got the bad smell that came out of his pennis. My mother, like a professional slut, told me to sit in the couch and watch her play. I did. The man turned his face towards me and winked at me with a wicked smile on his face. Then he inserted his dirty penis in my mother's mouth. As he did this, my mother moaned. Soon i could her slapping sound that was caused because of the upper part of his penis slapping my mother very fast. He kept on mouth fucking my mother and the sperm that came out of his penis kept on making my mother's cute face dirty. He inserted the whole lenghth of his penis mercilessly in my mother's mouth and throat which made her face a lot of pain. Soon my mother's face was totally filled with the water that came out of his dick. Even the black eyeshade which my mother used started making my mother's upper face get black stripes. After half hour of continues mouth fucking my mother, he orgasmed. As he orgasmed, loads of dirty white sperm came out of his penis which he threw in the floor. Then he made my mother lick the sperm from the ground and drink it. After the floor was cleaned with my mother's tongue, the man made my mother turn so that my mothers anus came in his front. As my mother did it, he, with his big, strong hands, slapped my mother's butt as hard as he could. My mother screamed out at this as it certainly was painful. He gave my mother eight more slaps. This made my mother's butt become red in colour. He then said to my mother,"Thank me you slut, thank me for using a dirty ass like you." As he completed saying this, my mother, turned towards him and like a very obedient slave, thanked him in her sweetest of all voices. The man caught my mother neck and pulled her up. I could see the pain she was facing as he grabbed his small skinny neck. He then slapped my mother on her face saying that my mother did not thanked him nicely and then pushed her back. My mother fell down. I ran to her and tried to help her stand back. The man left our house. Then my mother turned her face towards me and said, "Don't worry, your mommy is ok. I have done this a lot of times before when your father is out of home. Its just a way i pay my friends for being my friend. She then took out her panty and told that a slut has to face pain once or more in life and gave me her panty. She then walked out of the room, showing me her naked vagina as she bent and jerked her ass to tease me.