"Tom's trying to get Kristin to play." Your sister?" Yeah. She's very good, but terrified to play in front of people." Well, he got her over to the pi...no," Evan pointed out."Hey, guys," Tom told the cast, "This is Kristin. She's my girlfriend, and Warren's sister. I want her to play because she blows me away." I do not!" Kristin hissed, blushing. "Tom, please..." Kris," he said softly, "trust me. If you play for these people you will not regret it." OK," she sighed."Play the Pathetique," he. I was thinking as fast as I could just to keep up with her."Bend over my lap!" I ordered.She obeyed my order eagerly, and I could feel her pubic hair as the very top of her pussy pressed painfully but thrillingly against my swollen dick, bent down beneath the weight of her."Tell me when you think you've been punished enough," I said, still just feeling my way through this situation."Punish me hard," she panted.Tentatively I slapped her naked buns."Harder!" she gasped.I slapped her harder, hard. I don't now if he was tiring or was just getting passionate due to being sky high, but whatever it was, his stamina was really impressive.It was then there was a knock on the door, and Tom said "that's them" I started to get up, but David pinned me down, said "don't worry baby, it's just the candy man" and continued with his grinding. I was a little apprehensive, but secretly, I was a little thrilled because I really get excited being humiliated or shown what a slut I am in public, in front of. No, baby, we can't. You're my daughter..we could get in trouble." he said, but didn't dare move my hand from stroking his cock, which was now getting rock hard under my grasp. I knelt down on my knees and put his cock in my mouth and slowly began to suck it, while I continued to stroke him with my hand. "Yeah baby, that's right..suck daddy's cock just like that." my dad encouraged me. As I kept going with my oral torture, I began to strip myself of my nightie and my panties. My dad's eyes grew.