Fucking mom while she is lying to my dad over the phone

I went home to pick up a couple of video games to take to my friends house and I overheard my mom talking on the phone. I quietly opened the door a little to check on her and I heard her talking to the pool guy about coming over to fuck. WTF! This slut is cheating on my dad while he is out of town. She told the pool guy she was going to leave the back door open for him to sneak in and take her. She wanted him to surprise her. Well, I have a better idea, I'm going to surprise her! I waited around for the perfect moment. She put on a sexy black satin nightie with no panties on. What a slut my mom is! She went in the kitchen and the phone rang, it was my dad on the line. I took a look to see where she was and her back was turned toward me, now is my chance. I went up behind her and bent her over unexpectedly. I grabbed her by the neck so she could not look back at me. I fucked her while she was lying through her teeth to my dad. I'm going to teach her a lesson about cheating on my dad! I fucked her hard for a few minutes and when she was really enjoying it, I turned her head around to see me, she was horrified and pissed off. I would not let her go until I came all over her slutty nightie!