I pulled her panties down and she arched her back and spread her legs.I widened my legs to get low enough and pulled my cock up against her slit. I r...ubbed it up and down her slit as I felt her open more and more. I pushed it in about an inch until it became hard to go further, then I pulled it out a little and then shoved it in balls deep. She gasped and then moaned. I was sliding in and out of her with my hands running up and down her back. I grabbed her hips hard and started to thrust in. My other hand was trying to get a nipple hard through her shirt and bra, and her other hand was pulling on my dick shaft and squeezing the head. After her second shoe thudded to the floor, I held on to her tits with my fingertips while I thrust my hips at her. She made a moaning/growling noise as my tip started to leak, squeezing my shaft hard with one hand while using her other fingers to smear the semen around the head.Then she hopped down and I tried to undo her pants with one hand while. I dark shroud of guilt is wrapping itself around my heart at the thought. This man is not just my dad. He's the love of my mother's life. Her man. I keep sucking, the sounds coming out of my father's mouth, the rumbling in his throat, the panting, the feel of his hands resting gently on my head, everything is too wonderful to let guilt stop me.I pay attention to his reaction, watching his face while I suck his cock, carefully noting the changes in his breathing, taking all the clues he's giving. As I moved from her pussy to her boobs, my dick dragged across her body, to which she laughed, saying that it tickled.I grabbed my fully erect dick and plunged deep inside her, generating the first howl of hers."Aaaaauuuuugggggghhhhhrrrrrrrrr," is the closest I can come to the sound I heard. Thank god, I sent the girls to one of their friend's house. While they knew that Claudia and I had become intimate, hearing her howl like a wounded wolf might have them coming to see if I was strangling.