Trial run with a tail

It was late afternoon on a Friday, the weather was hot and the sun baked everything in sight. I was out by the pool when my sister entered the back yard with Ellen in tow. "So, I suppose you have had your nipples pierced." I said. "Show me."

Ellen quickly removed her shirt and showed me her newly pierced nipples. She had nipple rings already in place and she thrust her breast at me so that I might admire the work done on them. I had her remove the rest of her clothing. "I hope that I please you." She said.

"I want you to try something for me." I told her. "I want you to let Kate insert this tail into your anus. It isn't very big but I am thinking that I want to train you as a pony girl."

I let Kate insert the ponytail into Ellen's anus, I had Ellen put on the body harness and I put a soft bit into her mouth. Kate brought out the pony cart and she had Ellen hooked into the traces. Using the flail on her bare buttocks I had Ellen pull me around the backyard three times before I released her from the traces. "You were a very good pony girl." I said as I had her kneel next to me. I looked at her sweat covered face as I stroked her hair and I removed the bit gag. "Did you enjoy your first pony lesson?"

"Yes Master I loved every moment especially when you used the flail on my ass. I think that I have finally found my true self. I have found that being your sex slave catering to your needs and the needs of Kate and Paula makes me very happy."

I let Ellen remove the harness and the tail and I had her hold out her hand. I put the ring onto her left ring finger. "This ring is to let others know that you are no longer in the market for a boyfriend, you are my girlfriend and as such you will get to spend the night here is that clear?"

"Thank you Kevin," Ellen said. "Kate bought me this new collar would you please put it around my neck?"

The collar read in shinny silver letters "SLAVE" I put it on her. "Let me remind you of one very important thing." I said. "Right now there are only three people who have the right to touch you and make love to you but I will have the final say." I stroked her breasts. "You do not have to wear the collar at your job or in your home but when you are here you must have it on."

"What are you smiling at Master?" Ellen said since I was staring at her.

"Sorry about the zone out." I said. "I was just picturing your beautiful flat stomach becoming rounder with our baby. I am picturing you pregnant and naked."

Ellen said nothing for a long moment as she ran her hands over her flat belly. She looked at me with a really big smile. "I think it would be perfect Master, you should be the father of any children that I might have after all I am your girlfriend now and I plan to be the perfect slut." She saw my erection and without saying a word she climbed onto my lap and lowered herself onto my cock. "May I begin working on getting pregnant my darling Master?" She even neighed like a horse just to please me.