Monica and I walked back into the living room to rejoin Allison and Kristi. They were still holding each other tenderly on the couch. Holding the strap on dildo up in front of me, I asked, "Do you girls know what this is?" Allison slid her body off of Kristi's and sat next to her on the couch. "I do MASTER", was her reply. "No...well, maybe..I'm not sure", stammered Kristi. "Tell Kristi what it is, Allison", I said, handing it to her. "Its a strap on dildo, Kristi", Allison explained. "You see, it is alot like the double dildo that we used one night, but it has a strap on it that lets one girl wear it. It also has a shorter end for the girl that straps it on. It lets one woman fuck the other one much like a man does." "Have you ever been fucked with a strap on dildo, Allison?", I asked. "Oh, yessss, MASTER...many times. Its wonderful!!", she replied. "I think that Monica and I would enjoy watching Kristi fuck you with the strap on dildo, Allison...would you like that?", I asked, smiling. "Ummmmmmmmmm...Ohhh, that would be great!! Will you Kristi? Will you fuck me with it? Please??!!??" Kristi smiled a wicked little smile. She seemed to be over- coming some of her shyness now. "You need it, don't you Allison?", she asked lewdly. "Ohhh yesss, Kristi! I need it so baaaad!", Allison moaned. "But what will you do for me if I fuck you with it?" she asked, teasingly. "What would you like, Kristi...just tell me...I'll do anything for you...just tell me!" "Will you let me fuck Abacab when we get back to your house? Will you do that for me?", Kristi asked hotly. I later learned that Abacab was Allison's pet name for her husband. "Yessssss...and I'll kiss you while he fucks you! Anything...just please fuck me with the dildo!", Allison said. "MASTER, will you help me strap the dildo on?", Kristi asked, with a sexy smile. "Of course Kristi...come here", I said. It was a pleasure to strap the dildo on Kristi's sexy body. It looked very sexy on her and she moaned as I slid the short end of the dildo up into her still wet pussy. Tightening up the buckle in back I turned her around to see how she looked with a fake cock sticking out from her crotch. "You look like a real slut fucking bitch now Kristi", I smiled. "Like the way our little slut looks, Allison?", I asked her teasingly. "I love it!!!!", Allison exclaimed, and slid off the couch to lay on the floor on her back with her legs spread open wide. "Do me, Kristi...do me good and hard...fuck me rough, use my cunt!!" Kristi knelt between Allison's opened legs and slid the head of the dildo into her hot pussy. She hunched forward roughly and began screwing her wildly, fucking the hard shaft of the fake cock all the way into her hole with every thrust. Each time she slammed the dildo into Allison she was of course slamming the short end up into her own fuck hole. She began to writhe and twist on it as much as possible, trying to rub her hard clit against the top of it as she screwed her friend and lover. "You're a good fuck, Allison!!", Kristi said lewdly, as she continued to pound the plastic dick into the moaning whore beneath her. The two of them became lost in their passion as Monica and I watched them with wide eyes. Kristi had surprised me and was taking to this like a duck to water. I slipped into the kitchen to get the camera. When I came back I motioned for Monica to move over to Kristi's right as if she wanted a better view of what was happening. As Kristi turned her head slightly to glance at Monica, I snapped the first picture from the left, getting a good shot of the dildo as it moved back on its outward travel. The flash startled Kristi and she jerked her head back to the left and stared at the camera with wide eyes. "Nooo, don't take pictures of me doing this!!...Please don't!", she pleaded. I laughed and took another quickly, this time with her contorted face turned toward the camera. The camera flash had done nothing to dim her passion for fucking the horny slut beneath her, however, and she continued to pump away at Allison who was now moaning softly. Kristi's eyes closed with passion and she shook her head wildly as her own lust mounted. "Oh, fuck! Who cares? Take all the pictures you want. Take them...I'm nothing but a dirty tramp slut anyway, fucking an even dirtier bi-slut whore. Unggggggggggghhhh!", she moaned as she fucked away, her hips pumping lewdly. As I continued to take pictures of them, Monica stepped over Allison's naked body and presented her naked pussy to Kristi's mouth. Kristi leaned forward and began licking Monica's cunt avidly as I snapped yet another picture. When I had finished the roll of film I walked behind Monica and pushing on her shoulders, lowered her to her knees over Allison. Kristi began kissing Monica's open mouth as I knelt over Allison's head with my legs spread and began rubbing my cock up and down Monica's juicy slit. I felt Allisons head rise toward my ass and soon felt her wet tongue licking at my asshole. The feel of her tongue probing my anus sent my hips forward quickly and my cock rammed up into Monica's fuck hole. "Ohhhhh, yessss...fuck the slut, Kristi", I moaned. "She's licking my ass while I fuck Monica, Kristi...fuck her hard, the dirty little tramp!!" Unable to reply because of the battle her tongue was doing with Monica's, Kristi merely moaned hotly and fucked ever harder into the trembling cunt of her very busy friend. I discovered that I could reach around Monica and Kristi both and did so, my hands kneeding the soft but tight flesh of Kristi's ass and caressing the straps of the strap-on dildo as they crossed her skin. I pulled her hips forward roughly, helping her to fuck Allison even harder. Slowly I slid my fingers closer to the crack of her ass, pushing Monica closer to her as I did. Their breasts were rubbing each others breasts as they kissed now and I slid my finger into the space between Kristi's ass cheeks, searching for her hole. Finding it, I pressed the tip of my middle finger against it and pressed gently. Kristi moaned loudly and hunched her ass back at the intruding finger, taking half of it inside in the one lunge of her hips. I began fucking my finger in and out of Kristi's tight little bunghole as she continued to fuck Allison over and over with the fake cock strapped to her waist. Suddenly Allison reached up and wrapped her arms around my waist and pulled my ass closer to her face, sticking her tongue inside. My hips flew forward, my cock hitting bottom now in Monica's tight and juicy cunt. Suddenly we all began coming at once, the air filled with passionate moans and groans and dirty, hotly spoken words. My cum shot up into Monica's body and filled her hole to capacity. I felt her lips gripping my cock and milking all of the cum she possibly could as her mouth continued to press itself hard against Kristi's mouth. Kristi's ass cheeks were clenching my finger now, squeezing it as the sphincter muscle tightened and released, tightened and released. Suddenly Allison's head fell away from my ass and her arms dropped to her sides. I slid my dick from Monica's slut-cunt and sat next to Allison. She had passed out as I had expected, and I watched her carefully to be sure she would be alright. Meanwhile, Kristi and Monica had grown weak themselves and had struggled off of Allison's now still body and were sitting quietly watching her and letting their still trembling bodies return to normal. "Is she alright?", asked Kristi, concerned. "I didn't hurt her did I?..please...is she ok?" "She'll be fine Kristi...she just comes very strongly at times and drifts off for a moment or two. She'll come to in a bit", I reassured her calmly. "In a bit" turned out to be nearly five minutes, and I was concerned by the time she did finally come to. Allison opened her eyes and looked around her and then smiling weakly, said, "Ummmmmmm, that was great! Thank you MASTER, for letting Kristi fuck me so nicely!" With a sigh of relief from all of us we smiled back at her and marvelled at the passion that had filled the room. I sent the girls off to shower together and fixed a good supper for them all. After we ate we sat around and discussed the joys of sex, with Kristi learning alot about what being a submissive slave-slut could mean to her in the days to come. It had surprised me somewhat when Monica had asked if she could sleep with Allison that night, but I consented amiably, of course. I was glad to see Monica displaying more interest in our experienced bi- slut whore friend, and to be honest was excited about the prospect of having Kristi in my bed for the night. Evidently that prospect excited Monica as well. "Kristi hasn't been fucked yet, MASTER, nor has she been able to take your cum in her mouth. Besides, I want her to get a taste of what its like to be with you so that the next time she comes she will be willing to do some submissive things for me if I allow her to fuck you!", she said, smiling. "Well, Monica...aside from it being a rather romantic notion that you could ALLOW her to fuck me, as if a slave has any say so over what holes her MASTER'S cock dumps its cum into, your sentiments are very kind and understanding. But I have an idea that you have Allison's huge pussy on your mind. No doubt you'd like to do a little fist-fucking before the night is over...am I right?" "Ohhh, MASTER...you know me so well!", she said with a grin. Allison was quite excited about the plans for the rest of the evening, and Kristi seemed to be willing enough. I sensed that her small amount of hesitation was partly out of desire for Allison's feelings to not be hurt and partly out of concern for what it might be like to spend the night with a MASTER. Both concerns were understandable. A bit later, after Allison and Monica had had their turn, Kristi and I showered together in preperation for bed. Her body felt wonderful as my soapy hands traveled over her breasts and her ass. The time we spent in the shower was good time. It allowed Kristi to feel more at ease with me and allowed us both to rejuvenate somewhat from the tremendously exciting events we had already shared. I dried her off gently with the big soft towel and laying her on the bed massaged her body firmly with baby oil covered hands. She lay with her head turned to the side and her eyes closed, smiling warmly at the sensations the massage was causing her to have. I spent an inordinate amount of time on her ass, transfixed by its beauty and the way it felt as I massaged the oil into her soft skin. When I rolled her over and massaged the front of her body it was the same with her breasts...I couldn't seem to get enough of rubbing them and spreading the oil over them. The longer I massaged them the longer and harder her nipples seemed to grow. Finally my throbbing cock told me the massage was over, and I lay on top of Kristi and kissed her mouth gently. She returned my kisses eagerly and as I began to move my hips rubbing my hard cock against her soft belly, she whispered softly, "Lay on your back...I want to fuck you." Smiling warmly at her and content to let her have her wish, I lay beside her on my back and watched as she straddled me. She lifted my cock with her hand, holding it straight up and slowly lowered her cunt down on my long pole. She didn't stop until she had the full length of it inside her and then just sat there hardly moving at all. Slowly she began clenching and unclenching her muscles, milking my cock as she did so. I looked up at her swaying breasts and her small smile and began slowly moving my hips in tiny circles. Her hips joined the movement of my hips as we ground our pubic bones together. She leaned forward, letting her body rest on mine and kissed me deeply. Her hips began to rise and fall now, her cunt sliding up and down the length of my thick fuck meat. My hands moved to her ass and pulled at her cheeks, massaging them, spreading them, pulling her body back down onto me when it pulled away. We fucked slowly like this for a very long time, both of us struggling to hold our passion in check and to take time to enjoy the long slow fuck. Breaking our kiss and breathing hotly in my ear, Kristi began to whisper to me as her hips began to move more rapidly up and down. "Teach me...please teach me..I have so much to learn. Teach me to be totally submissive, teach me to love it all and need it all as Monica and Allison do. Let me come back and be your slave again. I need to be trained and used. Be my MASTER!" Later, when we had both come strongly and had rested while holding each other tightly, I lay on my side and spoke to Kristi quietly as I let my fingers run up and down her body lightly. "You'll make a wonderful slave Kristi. You have the body and the mind and spirit to be a perfect slave. But you're strong-willed, and not used to being submissive, I can sense that. It won't be easy for you to learn to be totally submissive to a man. I can do it, with Monica and Allison's help, but you have to promise me that you'll try very hard, and that you won't give up easily." "I know...you're very right about it all. But I will try hard and I won't give up, I promise. When I want something badly enough I'll do anything to get it. I want this. I want this very, very much." I kissed her warmly and smiling into her eyes, said, "Sleep now, Kristi. There will be other nights for us...other times for you to take my fuck in your mouth...other times for me to use your slut body to make my cum shoot out of my cock. Rest now and sleep." I awoke only once during the night, and smiled softly at the sounds of the moans coming from the other room. My last thought before drifting off to sleep once more was the recognition that I was in bed alone. The next morning I made no mention of the fact that I was aware that Kristi had slipped from the bed in the night, nor did she. She was there beside me when I opened my eyes to see the sunlight streaming through the windows. As I looked at her peacefull and pretty face I could see a slight film of dried cunt juice on her cheek. I slid the covers slowly off her and looked at the youthful firmness and fullness of her ripe body. I continued sliding the covers down until she lay completely nude on her back with her legs slightly parted. I stood at the foot of the bed, staring at her quietly, enjoying the sight. The door opened slightly and I saw Monica sticking her head in and smiling warmly at me. Holding my finger to my lips I motioned for her to come in and she moved to my side and slipped her arm around my waist. We stood together quietly and looked at Kristi in her nakedness. Looking up at me, Monica whispered the question softly. "Will she make it?", she asked. "Yes...she'll make it just fine", I said. Quietly we slipped from the room. Later after Allison and Kristi had left I sat holding Monica in my lap as she slept with her head on my shoulder. I didn't know when Kristi and Allison would be back, but I knew they would. Kristi would be different when she came back, Allison would see to that. But she still would be hungry to learn, and learn she would.