Reply: Sons girlfriend

You might think this is bullshit but its true.
I am a 40 year old man and have a son whos 18.. Well he has a girlfriend named Rachel. Im not sure how long they had been dating but it was for at least a couple of months.
Well one day when i just got home from work early i didn't think anyone was home.. Well.. I was wrong. When i walked upstairs I heared a noise from my sons room! I went over to see what it was but i peeked through the door to see my son Dean and his girlfriend screwing! He was thrusting her really hard.. Her giant tits were bouncing in the air! She was holding on to his sides and moaning.. Then she looked over and saw me but I don't think my son did. She smiled and then turned away.. I got a hard on and had to go into my room and masturbate.
A week later one night my son was at his friends Rachel rang the door bell. I answered it and said hello. She asked if Dean was home. Of course i told her where she was. She then said GOOD. Which surprised me. I said "What do you mean?" She then smiled and said. "I want a real man to teach me." She smiled and started for the couch. I quickly followed wondering what she had meant. She was wearing a tiny tight white dress and i could see her black thong. Her waist was so thin and her tits were so huge! I just wanted to fuck her! Well then we sat on the couch. I asked.."Did you need somthing?" She just smiled and then got on her knees and undid my pants. "I want some real loving." She said. My first thought was hell yah! My second was what a slut! I let her suck my cock. She was wonderful at it! I was happy to have a good blow! I moaned really loud and I then looked at her. I pushed her off of my dick and started stripping her! I practically ripped off her clothes. She wasnt wearing a bra.. I then started kissing her stomach all the way till i reached her black thong. I then yanked it off with my teeth and then started eating her out! She moaned and smiled. I then stuck my cock in her pussy and started thrusting so hard i got sweaty super fast. She was moaning and grabbing her breast and yelling more.. SO i did it more..
After it was over she kissed me and told me she would be back.. We now do it when im alone and my sons gone. My wife or son don't know and im glad about that. But I guess that makes me a real shitty dad.