Sam looked at her frozen on the spot. He had to decided soon or...
"Times up." Jennifer said with a, now much larger smile, still plastered across her face. "You will Transform into the most attractive dog in the world" She said bluntly and allowed a few moments for this to sink in. "For your dare, you will love me and only me and will, when I'm in heat, want nothing more than to have continual sex with me. Yet you will not be able to make me pregnant and you two will be immune to the effects of the curse." She said it with such conviction that few would realize she was under the influence of the Previous dare. It was hardly a punishment but she needed him. She wanted his cock banging into her behind and brushing his belly up against her tail. She no longer cared about anything else. She had to have him inside her.
The transformation began and he slowly began to degrade back into his dog form. To the untrained Human eye it would appear if he were almost exactly the same as before however there were a few subtle differences that when Jennifer saw drove her crazy. Sam looked at her with longing through his new Canine Eyes and instantly walked up to her.
Jennifer turned around and bent over, allowing Sam full access to her rear. In no time at all his penis was unsheathed and at the entrance to her wet cunt. With a push it was in and Jennifer screamed in pleasure as her new instincts completely took over. Somewhere in the recesses of her mind she knew how horrible everything was. She was a playboy bunny being taken doggy style by her once faithful dog who had already had done this to her. She rock back and forth as he hammered into her. Her large bare breasts bounced rhythmically and her tail twitched in time with her ears. She began to breath heavily as she reached her climax. In no time at all she was screaming out, her juices flowing and mixing with Sam's who was left Panting as he continued his domination of her Pussy. She collapsed with him still on top of her after having possible one of the best orgasms of her life and grateful that of all the people to do it too her, it was Sam.