The viper woman continued to develop into a strange snake/human hybrid of her former self. She was so big now, so much more than what she used to be or could ever have hoped to be.
Vipress waited, watching the stumps of her growing arms pressing out longer and longer as they gained definition, and just as she thought she might gain hands, her changes faded and stopped entirely. She was done for the moment.
The snake shifted on Brendan's bed, adjusting her now massive serpent's tail, and looked herself over from top to bottom, analyzing her new body. There was her head, her long beautiful face, and below that a solid foot of neck. Her shoulders and chest were below, which curved off to a feminine midsection. This suddenly swelled to the top of her tail, her slit set between that area, and her tail tapered gently to the tip, fourteen incredible feet long, powerful enough to do whatever she pleased. She flexed it experimentally, and found the appendage as flexible as it had ever been.
Then there were her sadly incomplete arms. They were formed, long and feminine, but lacking hands. They terminated in shapeless nubs, though she found she had all the joints. A last quick glance confirmed she was still all scales and scutes, thankful for the humanity not having overtaken her.
"Slave..." She turned to a trembling Brendan, who was now once again afraid for his life. "Do you realize what you've done to me?"
"I-I didn't know!" Brendan sobbed. "I'm sorry mistress!"
"No..." She leaned closer, and put her arm around his shoulder, pulling his naked body closer to her. "I love it. I need another dose to finish the change."
Brendan's eyes widened. "Another... dose?"
"Fuck me." She commanded. "Now. Give me your semen and make me change further."