Right after dinner, the doorbell rang and it was Darren, his friend, and a beautiful black lab. He was a big male, but proved to be very friendly and gentle with the kids. They took to each other right away. Tom talked with the guys as Tracy cleaned the dinner dishes. She came out later to meet King, their new dog, and to thank Darren and his friend for the dog. He was friendly to everyone and seemed right at home within minutes. Bill, Darren’s friend, told them when he fed King, when he walked him, etc. He told them that he loves to walk, and does not pull; a baby could walk him. He loves to play and chase the ball. He told them he needs exercise, so play with him as much as they could; especially weekends.

Soon the men left and King was taken out for a bathroom walk, and then put to bed in his crate. He had been crate trained and loved it. It was security, especially in a new house. The kids were very excited, but were told they needed to go to bed; they had school tomorrow. Reluctantly they went to bed, but vowed to be up early.

Tracy was especially wet as she made love to Tom. She knew why, but tried to put King out of her mind.

The next morning Tracy woke up fairly early, but heard that the kids were already up and playing with King. She slipped on pajamas and went downstairs. Brad said that they already given him his morning walk and wanted to know how much to feed him. Tracy read the bag and told them the amount. They fed King as she fixed them breakfast. Soon Tom was up at the smell of coffee. They all sat at the kitchen table and ate. King was under the table, getting scraps from the kids, but when they stopped he found something nearly as exciting. He stuck his nose between Tracy’s legs and got a big whiff of cunt. She quietly pushed him away and got up from the table. She told everyone she was going to get a shower then get ready for work.

Tom came up as she was dressing and hoped he did not notice she was putting the skirt on without panties; since she no longer was allowed to wear them. He did not seem to notice as he was getting ready himself.

Tracy headed to work soon after dressing and stopped in back of the building to remove her bra; as had become routine. Darren was not there when she arrived, so she started working, but followed him in when he arrived. He did his morning check and insertion of the egg vib.

At lunchtime, Susan appeared and told Tracy they were going back to her house for lunch again. As soon as they arrived, Tracy was told to strip. Once naked, she was told to go get King from his crate. On the way back to the living room, King sniffed at Tracy, but was very docile. Susan told Tracy that King was well trained and unless given the command words, would act like any other dog. She told her that once given those words though, Kings was a stud dog, and would not be denied his bitch; Tracy in this case. Susan whispered into Tracy’s ear what to say and then once she said it was to get on all fours for him.

Tracy repeated the code words to King, KING FUCK ME, and then got down on the floor. King was immediately on her, sniffing and licking her cunt. She orgasmed right away, driving King into a frenzy. He mounted her and began fucking her cunt, hard and fast. Soon she had cum three more times and felt his knot at her cunt lips. With a few more hard thrust, she was knotted to his new bitch. After what seemed like hours and many, many orgasms later King eased off Tracy and went back to his crate.

Tracy looked up at Susan, who had video taped the whole thing, and asked if she could get cleaned up. Susan gave her permission and when Tracy moved to get up and huge glob of cum oozed out of her cunt onto the floor. She was glad it had not hit the rug in front of the couch, but had fallen on the wooden floor. Either way, Susan made her lick it up before going to get cleaned up. She cleaned herself and then returned to Mistress Susan. Susan told her to close her stud in his crate, get dressed and they would head back to the office.

Tracy could think of nothing else but King, as she made her way back to work. Was this part of her routine now? When they returned to work, Tracy was required to go report to Darren. She had to tell him everything, in detail, what had happened. As she did she became extremely wet.

The rest of the day went without incident, but it was hard for her to focus on her work. When she got home, she saw the kids playing with King. She was amazed at how demanding he was when he had been given the command words, and how gentle he was now. Even so, she could not help remembering him fucking her hard and fast and all the orgasms she had had. She wanted to command him, right then and there, but there was no way she could; her whole family was right there.

Tracy tried to stay away from King, as much as possible. She was scared he would try to use her again. King had been trained well though. He would act like a regular dog, unless given the command words.

Tracy getting fucked by King became a part of the routine. Each day, for lunch, she was required to come home, strip, and become King’s bitch. She would be soaking wet before she ever got home. Sometime Susan would go to her house to watch, often times, not. It didn’t matter if Susan was there or not, Tracy needed her stud dog.

One afternoon though, Tracy was busy with King when all the sudden the front door opened. Tracy nearly had a heart attack, but could do nothing, as she was knotted to King. She was glad to see Susan come through the door. She had forgotten that Susan and Darren had keys, and access, to everything she owned.

Susan waited until King had finished with Tracy before she said or did anything. She did not want to spoil the moment. Even with Susan watching, Tracy came twice more before King finished.

Susan walked over to the bookcase and retrieved a small video camera, which had been hidden earlier. Tracy’s whole afternoon with her stud dog had been caught on tape. She knew she could do nothing about the tapes; she couldn’t even do anything about King; she needed him now; she belonged to him. Her whole body and soul craved sex. She did not know why, but she needed it. Tom loved the extra attention. He was satisfied every night she was at home. Sometimes she would even give him a blow job in the morning. It was getting to the point that she would even grab him and tease him while the kids were in the house.

Tom didn’t mind. He figured she was just maturing and becoming a more open woman. He knew she was dedicated to her work and was not fooling around on him; she didn’t have time.

On Thursday night, Tom told the family he had to be the one to go out of town for a few days. He told them that he was leaving Sunday afternoon and would be back on Friday. Tracy said she would make sure the kids were dropped off at school, and knew they would be okay till she got home.

The next morning, Tracy told Darren of Tom’s travel plans. Darren acted like it was just information, but as soon as Tracy was out of his office, he called Susan. They talked for a little bit making sure that they had something planned for Tracy’s evenings.