I couldn't get much sleep being strapped down in such a way, much less with that constant vibration bringing orgasm after painful orgasm.

Aside from the pain in my back, the orgasms felt pretty good, but after a few orgasms, even those got painful. After a couple of hours, the batteries must have finally died, and I could finally sleep, at least a little bit, as I was still so sore.

I was asleep when my sister came back in with her psychotic friends. They untied me and carried me over to sit on the couch.

"Did you have a good night?" Cassy asked me.

I just groaned as a response. They all laughed. All except Heather, who looked a bit...? Used would be the best word for it.

"Oh, I see you noticed Heather over here." Sarah said. "Cassy and I need to get off a couple more times while we edited and made copies of your little movie. We needed a pussy licker, and she was the only one close by." Cassy, and Sarah started laughing, and Heather bowed her head, but a slight grin on her face.

"Heather, be a dear and put in the movie we made so Lucy can see it." Sarah said.

Heather got up and put a DVD in the player. She sat down next to me and locked her arm in mine.

Sarah sat on my other side and smiled at me as Cassy hit play and sat down on the recliner.

I could feel myself go pale as I watched myself on the screen crawling around on the ground like a dog, with a collar and tail. I felt sick as they made me sit there and watch everything, the whippings, eating and drinking, even out of the toilet. Playing fetch, eating out a girl (of course they took out their faces), and even getting fucked by a real dog.

"Now here is the deal," Cassy started, "You are going to clean this whole house before mom and dad get back, then you are going to go down on all of us... And make sure you say thank you to everyone for showing you how to be a good girl."

"Be sure to remove your panties and put this on." Sarah said, throwing an apron at me.

I did as they told me, and as I pulled the apron on, I noticed with distaste that it didn't even cover my pussy, and of course the back was open anyway.

"And if you ever tell mom and dad what happened this week, we will make copies and make sure that everyone at your school gets a copy, instead of just the three of us." Cassy said.

I knew I would have no choice but to do everything they said, so I got to work cleaning the house.

I could feel their eyes on me everywhere I went. Every once in a while, I would feel one of them smack my bare ass. Another time, I was bent over washing the floor in the bathroom when Heather came in and sat on the toilet.

She grabbed my head and pulled it to her crotch as she spread her legs. As I stuck out my tongue to lick her, she started peeing! I shuffled back just in time to meet a strapon at my ass, and with a thrust from behind me, I was pushed back into Heather's stream.

Whoever it was was fucking me hard from behind as I was force to lick Heather till she had an orgasm, long after she had finished peeing.

I had cleaned the house for a few hours, doing everything, including laundry. It was about 2:30 in the afternoon when I finished.

"On your knees, slut." Sarah told me.

She was in the recliner now, so I got on my knees in front of her and immediately went to work on her pussy, if for no other reason than to just get it over with.

She seemed very pleased with me, and she kept saying things like; 'oh god you have gotten to be an obedient little bitch,' 'suck my pussy slut,' and the like. She came like a fountain, and then pushed me to the floor like a used toy.

"If you ever want to spend some time with your little puppy boyfriend, just let me know, I can arrange something." Sarah said. I cringed at the thought of it.

As she got up Heather took her place and through her legs over the arms of the chair as Sarah pulled her panties and shorts up.

SMACK! I heard it before I felt the hard slap on my ass from my sister.

"Did you forget something?" She said.

I thought for a moment, confused at what I forgot.

SMACK! Came another one. "I will keep doing this till it reaches your little head." Cassy said again.

Then it hit me. So did the 3rd pain smack to my backside.

"Thank you Sarah for helping to teach me to be a good girl!" I said quickly.

She patted me on the head, and smiled sweetly. "I've got to go; I hope we can do this again sometime."

She grabbed her things, including the collar around my neck and left out the back door to get her dog and leave as I turned to Heather.

She lifted her butt a bit and told me to start down there with a giggle.

I spread her cheeks apart and went to work on Heather. She took a lot longer than Sarah did to get off, but I managed after about 10 minutes of licking every inch I could get at, from her butt hole, to her clit. She came hard pulling my face so tightly that I thought she was trying to pull my head up her pussy.

She finally let go of my head and I sat back up on my hunches.

"Thank you for teaching me to be a good girl." I said timidly to her as she recovered and leaned forward.

She grabbed my cheeks and kissed me, sticking her tongue into my mouth. "I can teach you so much more, and would love to do it anytime you want, sweetie." She said before licking some of her cum from my face.

I must have been blushing a bright red, because my sister said: "Oh look at what you've done, now I can't tell what I'm looking at, her face or her ass."

Both of them started laughing at me.

Heather got dressed and told my sister that she would see her later, and then left out the back door as well.

"You stay put while I go check the house."

She came back soon enough and took her place on the chair, spreading her legs.

"You did a good job cleaning; now finish and you can go to your room or whatever till mom and dad get home."

I nodded, and then climbed up my sister's naked body, surprising even her as I took her firm breast in my mouth. She closed her eyes and let out a groan as I hungrily sucked her breasts. I eventually started kissing my way down her body, teasing her. I got to her dark pubic hair, and ran my fingers through it, and down to her clit as my tongue trailed slowly over her labia.

She let out a long drawn out sigh as I slipped 2 fingers in her very wet pussy, and ran my tongue over her clit.

I was enjoying this as much as she sounded like she was.

I attacked her pussy for 15 minutes, bringing her close then stopping again. Then I grabbed her ass cheeks and pulled them apart and licked her butt.

She was moaning and squirming on my tongue. After another 5 minutes of that she was practically begging me to get her off, so I shoved 2 fingers into her ass and latched my lips around her clit, trying to suck it off and out of her pussy.

"OH FFFUUUUUUCCCCCKKKKK!!!!!!" She screamed, arching her back off the chair holding my head as tightly as she could.

As my sister came down from her most intense orgasm she had ever had, she surprised the hell out of me as she jumped me, pushing me to the floor sticking her tongue in my mouth.

"Cassy, wha..."

"Shut the fuck up." breathing heavily.

She moved down between my legs and started licking my wet pussy.

"AAAAAAHHHHH," I started to cry out as she licks me for the first time, with a hunger that I have never felt before.

It didn't take me long before I was arching my back and humping against her face, Cumming hard.

When my thrashing around finally came to an end, she climbed up my body and kissed me hard again. She let the long kiss end, and looked me in the eyes.

"If you ever tell ANYONE that I licked your pussy, I will make sure you regret it for a VERY long time... Got it?"

I was still breathing heavily, and in shock that all I could do was nod.

"Good, your room is unlocked, so get away from me. Mom and dad will be home soon, and remember what I said... We still have a video if you tell anybody about this week."

With that, she left me lying naked on the floor.

***

Another couple of hours later, mom and dad got home. We went about our usual routine, and they never suspected anything strange happened over this last week, thinking that my sister and I had just avoided each other as usual.

Epolgue

Months have passed by since that horrible, yet wonderful week with my sister had happened. Nothing more happened between my sister and me, nor have I even seen her friends.

I turned 12 in November, and now Christmas vacation had started. Over the last few months, I found myself thinking of that week, I even try masturbating, but I can't get myself off!

Late one night, I knocked on Cassy's bedroom door.

"Come in." She said.

I timidly entered her room; I know she doesn't like me to bother her.

"What do you want?" she asked me.

"I...Um...I." I stuttered.

"What! Just spit it out already." She said, starting to get testy at me.

"I'm sorry." I said, turning to run from the room.

She grabbed my shoulder, and turned me around. I had tears in my eyes.

She sighed, "Come here, something is obviously bothering you, what is it?"

She brought me over to her bed and sat me down.

"Do...Do you remember...Um, what happened last summer?"

"Of course I do. Is that what this is all about? Are you mad at me?" She asked.

She sounded a bit worried that she might have done something that fucked me up for life.

"Nn...No. I...I just...WOULD YOU MAKE ME YOUR PERSONAL PET." I said as fast as I could spit it out.

Cassy's eyes went wide. "You want me to do that to you again?!"

There was shock in her voice.

"Um... Kinda." I whispered, not even looking up at her.

"Oh Lucy... I don't think that would be right. I think we went too far when I did it, I even destroyed the copy of the video that I had, and I asked the others to do the same. I told them if they did keep it, that if they showed it to anyone, I would hurt them. I also told them to stay away from you, that’s why they haven't been over here."

"Oh," was all I could say to all that.

"Listen, sweetie. I will think about it, but I will tell you now... Don't get your hopes up, ok?"

"Yeah." I said. A tear ran down my cheek as I went back to my room and cried.

***

The week went by slow, and I never talked to my sister again about it. Christmas came, and we opened presents, and had family Christmas like usual.

That night our parents told us that Grandpa was sick, and they would be leaving after New Year’s and asked if we would be ok by ourselves. Of course we said we could handle ourselves.

I went to my room to go to bed that night and found a present on my bed. There was no note, but when I opened the package, I found a collar, leash, tail and a note that read: If you’re serious, you are mine forever!

I smiled, and put the collar on, and went to sleep.

Our parents left on New Year’s before we woke up, and after they left, I stripped, put the collar on, and the tail in my butt, and when my sister woke, I was sitting in her room wagging my butt, with the leash in my mouth.

She just smiled and pats me on the head.

I have been with her ever since. We are now in our 20's, and have a house of or own. I have everything, including a cage she puts me in when she is gone, and a dog house in the back yard, and I couldn't be happier.

---

If you enjoyed my story, feel free to post something, or email me, I like feed back and to know if people liked it. I have more stories on the way, sorry I took so long to finish this one, other stories seem to want to come out and I had to write down the ideas before I forget them.