I had just begun to get a good rhythm going when I heard a soft knock on my bedroom door, and then it opened suddenly. Standing at the doorway was Sar...h, in tears and looking visibly shaken. I abruptly stopped stroking and sat up in bed. "I'm sorry, sweetheart, I didn't know you were going to just open the door." I'm sorry dad, I hope I didn't embarrass you. It's just that...", she said, before stopping to choke back a cough and a wimper."No, you didn't embarrass me. What's wrong, what. You can stop that shyt now, my dick is up in your ass and it's gonna stay there so shut the fuck up! ... ' My body convulsed so violently that Bruce and Charlie had trouble holding me still. Daniel rubbed his huge hands over my buttocks and the small of my back as my thighs quivered frantically from the pain that was ebbing from my aching anus. Bruce was trying to push his semi erect penis into my lips as Charlie exclaimed ' ... damn, look at that ass hole. It's like it's trying to squeeze that. Soon I reached her crack and gave her a rimming of her life. Her humping my mouth gave me encouragement.I turned her around and her legs automatically wound up around my waist. As she bucked her hips demanding my cock, “Karo naaa” she whimpered into my ear licking my lobes.My cock easily found her welcoming hole and as I entered her she clutched my hair and crushed her lips on mine. Meanwhile her urgent pushes had a nice rhythm going and I just lay and gave her mouth a suck, nip, lick, slurp. "Nothing was said for a moment as my body never stopped jiggling, and they never quit eyeballing me."Who is that, Lacy?" the first guy asked."Oh, that is just my horny step-sister, Robin, and she is quite a dirty young woman, watching us have sex," she pointed out before she came over to me. "It is alright, I'm not mad," she assured me before she kissed me. "So you liked watching me with my two friends here?"I peeked at them as their cocks were completely visible. "Yes," I answered,.