I heard Kathy loudly tell Mark that she wanted to ride his big dick and I then heard the sounds of bodies shifting as the couple moved themselves into...position.Soon, I heard Kathy sighing softly as Mark told her to ride his cock. I risked a quick glance into the room and was relieved to see that I was safe for the time being; Kathy was riding his cock with her back to me; neither of them could see me as I peered around the corner of our bedroom door.My good friend Mark had both his hands on my. I put a pillow on my shoulders and she put her head on it close enough to me we could continue kissing. I caressed her from her shoulders to her ass as we kissed. She took a short stroke. I kissed her. She took three strokes and moaned. I kissed her. She sat up and began to fuck me. I kissed her tits. She had a big orgasm and collapsed on me. We kissed. She got up and walked out of my room. I masturbated. I joined her in the office and asked if there was anything to indicate if it was one. He washed my ass with his rough hand. I felt erotic with his actions. After that immediately inserted his middle finger in my anus. I jumped on the spot. But I didn’t stop him.He was inserting his middle finger of his right hand deep and deep into my asshole. I was jumping 3-4 feet in pain and joy. After fingering my ass for 10 minutes he removed my panty from my legs. He put it in my mouth and lifted me on his shoulder and held my nude ass globes tightly in his tight arms.And he walked towards. Oh my god why is my daughter affecting me like this, this is so disturbing and disgusting. Why am I allowing myself to be affected like this, why am I so goddamn attracted to her? She is my daughter for fuck sakes, she isn't my step daughter either, she was my biological, came from my balls, genetically matching flesh and blood. This is so wrong on so many levels, and it's even more wrong and disturbing that I was actually liking that fact that she was flirting with me like she was. Fuck I'm.