Terry and Sarah spent the weekend together, exploring Sarah's new snake body. Terry eagerly enjoyed living out his fantasies with a snake woman, though at times he struggled to keep up with Sarah's sexual appetite. For her part, Sarah could never remember having been so horny before. Sex with Terry was satisfying, but she would find herself soon eager for me. When he needed more time to rise the occasion, he used Sarah's snake vibrator on her.
Sarah was the first to awaken on Sunday morning. She cast back the sheets and got out of bed, stretching her legs, walking unsteadily. From the foot of the bed, she looked over Terry's modest body. Despite his lust for her and eagerness to please her, Sarah still craved something more. She realized that she wished Terry were a snake like her.
She leaned over the end of the bed, far enough for her head to reach his crotch. She engulfed his penis with her mouth, then his balls as well. Sarah wrapped her slender, flexible tongue around his shaft, stroking it. In all their sex over the last 36 hours she hadn't given him a blowjob yet. She felt him rapidly growing erect.
Terry's eyes sluggishly opened to find Sarah sucking his cock. He smiled, laying back, enjoying it.
Sarah had been careful with her teeth. They were sharper than her human teeth, especially her canines. Now she had a sudden, instinctive desire to bite. She didn't want to hurt him, but the urge grew rapid. Her reptilian biology knowledge was lacking - did rattlesnakes kill their mates like black widow spiders? The feeling became overpowering. She took Terry as deeply into her throat as she could manage then, without warning, sank her fangs into into his flesh.
Terry's soft murmurs of pleasure abruptly turned to screams of pain. He clutched the bed in terror, begged her to stop, feared she was about to bite his manhood off.
Sarah could feel the subtlest sensation of a tiny amount of liquid flowing out of her fangs and into Terry's body. Was it it venom? Rattlesnakes struck quickly then released, didn't they? What was she doing? But instinct wouldn't allow her to leg go until she felt Terry abruptly climax. She had never stopped felating him even as she bit him. Now she crawled onto the bed, crouched over him.
"I'm sorry" she said. "I had to."
Terry looked at her in confusion. Then he realized, despite the pain of her bite, despite his climax, he was still erect. He looked down to see his erection literally growing. His penis was growing in length and girth, and rapidly becoming covered in scales, except for the head.
"What did you do to me?" said Terry, shocked.
Sarah looked down and saw what Terry saw, and understood.
"I turned into a snake woman after a strange rattlesnake bit me" she explained. "It's venom transformed me. And now my venom is going to transform you into my perfect mate." The thought was making her wet.
Terry's heart raced. He wasn't just going to fuck a snake woman but now he was going to become a snake man whether he wanted to or not. For years he'd masturbated to a variety of snake women in stories and artwork, but he'd never really though about being a snake himself.
Sarah sat up, straddling Terry. She stroked his new snake penis and precum oozed forth. She immediately guided it into her and began riding Terry cowgirl-style. She could see the scales spreading up his stomach, faster than the scales had spread on her body.