I had been the slave of my catgirl stepsister, Me being an andromorphic dog made the step sister relationship even weirder. Dogs were almost always the doms in cat-dog relationships. This had gone on for about a month with my first experience she used me as a toilet and then stuffed me inside her ass for a week. After that she shit me out, telling me that having me suffer inside her had been the best experience of her life. Ever since then, it's been constant rape, vore, and being used as a toilet. Honestly I loved it most of the time, but it was nice to take a break from it occasionally. So I really valued the time I was spending with my best friend Cait lately. Cait was an andromorphic cow, towering over me at almost 7 feet tall, and with mass to match Compared to a dog boy on the small side. She was even more shy than I was, and we had just about everything in common; having been friends since childhood, we were inseparable.
 
 
We arrived back at my house to chill for a bit. Sitting down on the couch next to one another, we started watching TV. My sister having heard us come in, came and plopped onto the couch next to him. She gave Cait an evil glance and cait responded by by shaking her head no, my sister gave an exaggerated nod yes in response. "Are you going to tell him?" My sister asks Cait. "N...No......No, I can't, I'm too embarrassed, and I wouldn't want to hurt him" cait managed to squeak out. What the heck were they talking about? My sister stood up and crossed her arms, "I don't understand you Cait, you're bigger than I am, honestly, if you want just about anything in life, you don't even need to ask, just do it, it's not like people can resist". Cait bites her lower lip, "I....I can't, I wouldn't want to ruin the friendship." "Fine" my sister said, "If you're not going to tell him i will. Bro, Caitlain...." She's cut off by caitlin yelling "STOP!" My sister looked pleased, "see, just be more assertive like that. Bro, Caits secret is that she secretly in love with you and wants to use and abuse you". Caitlin blushed so hard I could see the red through the very thin fur on face, placing her hands over her eyes like she was embarrassed beyond belief. My step sister continued, "Yeah, we had a good long heart to heart the other day and it turns out that Cait has had a crush on you forever, and what's even more fun is that she's as sadistic as me!" I glanced over at cait and she managed to give a small nod before burying her face back into her hands. "She fantasizes about raping you alllllllll the time, in fact, she's roofied you twice and had her way with your unconscious body, I never understood this as she's big enough to just force herself on you, which btw, she has come close to doing to your conscious self many times" I could see cait trying to make herself as small as possible out of the corner of my eye, not an easy task for her. "We actually got into the conversation when I mentioned what I had done to you with my ass, and she let it slip that she would love to have fun with you the same way". I couldn't believe all of this, there were two sadistic girls in my life just rearing to abuse me. Cait looked like she was about to cry, I walked over to her and reached my hands around her to give her a hug and tell her it's ok, her stomach being so big my hands didn't meet on the other side, "It's ok cait, you don't need to be shy, I don't feel the same way about you, but maybe we could work towards that". During all of that, I hadn't even noticed my step sister sneaking up behind me.
 
 
In the blink of an eye, my sister had popped a ball gag into my mouth and was locking it behind my head. Cait looked up, "what are you doing?!" "Look cait, you need to gain some confidence fast, you dream about using him all the time, and if you want to build up to the sadist you want to be, you have to start working at it now. So take his body into his bedroom, and rape him!" My eyes went wide. Cait looked down at me, hugged me, and picked me up into her arms. Woah, this was going way too fast, I tried to push off to signal this was a bit much, but I could do nothing against my huge friend. She stopped in the doorway and turned to my sister "I'm not sure if I can do this, I've thought about it so much, but I don't want to ruin our relationship". My sister rolled her eyes. "Please, you know you want this, you know he's a sub and will just take it. Now I want you to think about his small helpless body underneath you as you furiously hump him, with that little puppy having no ability to resist". Cait looked down at me in her arms, this thought had obviously been a major turn on for her. Licking her lips she looked at me like she had lost her inhibitions' She carried me into my room and plopped me onto my bed. She started removing her clothes, seeing an opening when her shirt was over her head covering her eyes, I tried to run past her. She grabbed me as I ran past, her naked form lifted me up to her eye level and said "I've wanted this for a long time and this is happening, and please resist, I've always hoped that you would". She looked uncomfortable for a second as she just held me there, but I saw her confidence return as she stood up strait and a determined look crossed her face. She tore my clothing off and threw them to the floor. She tossed me onto the bed Climbing over me with her huge form, she positioned herself over my erect penis, I tried to say stop by nothing came through the gag in my mouth by muffled yells. "I can see you're excited for this too. There were so many times I've wanted to do this, so many times we were hanging out, and you were one sexual joke away from being fucked. I know I'm really shy, I've always wanted to tell you I love you, but I was afraid of how you'd react, but now I'm thinking it doesn't matter, I'll just take what I want." With that she slid herself down on my shaft.
 
 
She humped up and down, she was attempting not to put her full weight on me, but despite that I was pinned by a massive force. her hands found my wrists and she pushing them down above my head. She arched her back and put her face into my pillow, continuing to thrust with all her body weight behind it. Looking up, I could only see her chest as even lying down she dwarfed me. I felt a mild ecstacy, I was being raped, the feeling of hopelessness and being dominated were huge turn on for me, and being raped by my friend just made it that much better. I felt my orgasm getting closer as her fury continued. I felt her pussy tighten as she orgasmed herself. She sat up and looked down at me and smiled. "Not down yourself? Let's try this". She reached down under me and I felt a pressure at my anus. I yelped as she forced her huge sausage like thumb into my ass. This was too much, my body tensed, my eyes rolled back, and I shot my load deep inside her. She collapsed on top of me, letting her full body weight onto me. Her full weight came down on me and pushed the air out of my lungs. She layed there for a minute as I struggled to get air into my lungs. Cait sat up and slid down my bed bringing us face to face, she let her huge wide tongue out and licked from the bottom to the top of my face. "I've decided your my boyfriend now, as well as my property". My sister crept around the corner and looked upon the scene.
 
 
"I'm so proud of you guys, becoming boyfriend and girlfriend! I just hope you know this won't save you from me when she's not around bro" my sister said with a wink. I do have one more surprise for you guys. Cait can you bend over and look the other way?". "Um....sure....I..I guess" She turned around and exposed us to her big naked butt. What was my sister doing? She popped off my ball gag and grabbed a jar of something off the table and started rubbing it's contents on me. "Mmmmmmmmmmmmmm?" I got off through my gag. "Shhhhhh, stand still and upright" she replied as she continued to rub something all over me. Wait....I knew that smell, Vaseline, I looked up at my forced to be girlfriends butt and realized what my sister was planning. "mmmmmmmmmmmmmmmmmmmm!" I shouted and tried to step away. "No No No, hold still" My sister taking me into a headlock and continuing to apply it to me. "there we go, all done". Cait let out a small toot. "What are you guys doing back there?" "Don't worry about it cait, it will be a fun surprise, but could you be a dear and pull your cheeks apart? Thanks". My sister took off my ball gag and lifted me up, holding me by my head and crotch, hand covering my mouth. I yelped by this sudden sensation. She stepped behind my girlfriend and swung me like a pendulum: "ONE!" "No, sis, please don't....." I shouted by through her hand only came a muffle. She swung forward and back again, building momentum, "TWO!! "I'd much rather we work up to this!" I shouted, but through her hand, still more muffles. She swung me back further this time "THREE!!!" She swung me back as far as she could, using her muscles and gravity she swung me hard into my friends, anus. "No, I don't want to go up a cows butt!!" I managed to shout between her fingers.... Oblivious to all of this, Cait turned her head, "Wait what are you..?" she was cut off as I was plunged into her ass, my lubricated body shot deep inside her like a rocket. I was in a familiar place, before I could even get a wiff her colon clenched tight around me, putting me in pain and pushing the air out of my lungs. Outside Cait was having the biggest orgasm of her life and it was pushing the life out of me. Her eyes rolled back in her head, tongue drooping out of her mouth. After about 30 seconds of this disassociated state she snapped out of it. her guts stopped with their aggressive hug and I was able to breath again. Cait stood up, just my legs sticking out from the knees down. "Sorry about that" She poked at my face as it appeared on her stomach, "I didn't expect that, but it was amazing. Seriously, this is just about the best day of my life, I would have never guessed that the boy I loved would be inside me twice today". My sister let out a light laugh. "Speaking of that" My sister walked up behind cait and grabbed my feet. She pushed on them, making me go deeper into the guts of a cow, my feed slid past her anus and just for good measure, my sister reached in and pushed me up a big further. As she took her hand out, Caits anus clenched shut, sealing me off from the outside world.
 
 
Inside her I was getting to know what a cow could really smell like, even having been around her for so long, I wouldn't have imagined this stank. I sighed, if I was being honest with myself this was wonderful, my dirty fantasy being fulfilled by my best friend and being raped in the same day, by my best friend no less. I felt her poking at me on the outside as she examined her new form. looking at herself in the mirror she pressed down on my face. "I didn't expect that he would be so well defined, I can make out every part of him perfectly. I don't know if I could go out like this". My sister pushed down on Caits guts. This seemed to trigger something as a blast of hot air flew past me. I took a breath and gagged. My god, what did Cait eat? My sister kept pushing on my friends stomach and she kept giving me a sauna of her awful gas, before she let up. "Look see, you can't see him as well, just fart a bunch and nobody will notice". Cait nods. "I'm going to keep him in there for a bit, I really want to show him who's boss and where he's going to end up if he disobeys his girlfriend". My step sister sticks out her tongue and grins. "Just let me know when you're done, I'll try not to use the bathroom until then."
 
 
I couldn't believe that both girls closest to me had wanted to abuse me for so long I thought to myself. I managed to wriggle my hand down to my penis to play with myself while my friend was walking home.
 
 
I just wish I had found out sooner.