Panting, drenched in sweat, Brendan bit his lip and grunted as the snake tightened on top of him, helping both of them along by pressing her cloaca into his groin, driving his dick deeper, and receiving her own pleasure with each thrust as he hit her excited clit. She grew tense, her thick blue coils suddenly constricting him with unimaginable strength as she came into her second orgasm in such a short span. Her head raised into the air above him, she let out a terrific hiss of release, and then pitched forward, gasping for breath. Feeling her clamp down on him with her sweet warm snakeflesh, Brendan finally erupted his juices, unable to hold on, and then finally, together, snake and human collapsed in post orgasmic stupor.
Gently, lazily, Vipress loosened her death grip on her slave and coiled further around his body, her slit slipping off his shrinking sated penis with a hot juicy slurp. For a cold blooded reptile such as Vipress, the heat from Brendan's still excited body was the most comforting feeling in the world. She wrapped herself around him completely, covering most of his flesh, and her scaly cheek rested against his.
"God." Brendan finally whispered. "That was so wrong."
"Sssshhhhhhhh!" Vipress hushed him sharply. Her eyes closed, her body relaxed, and together the two of them fell into a blissful sleep in each other's embrace.
* * *
Brendan awoke some time later to find Vipress moving next to him. It was darker out the bedroom window, afternoon had turned to evening, and some time had passed.
The snake was lying on her back beside Brendan, the considerable length of her muscular body trailing behind her and hanging several feet off the bed.
She looked to Brendan, her expression frightened, and visibly gulped. "I'm... changing." She whispered.
"Are you shrinking back down?" He rubbed his eyes, and sat up naked beside his mistress. "Do you need another drink?" She still seemed as large as she had been after their snake/human encounter.
"No..." She said simply, waving her head towards her side. "Ssseeee?"
Brendan, groggy, stared at the tubular body for a moment, uncomprehending, and then realized what she was looking at. On either side of her body, bulging, were two small bumps pressing out from her scales. They were growing.
"What the hell?" Brendan gaped, getting in closer for a look at one of her sides. The snake, too, looked closer, and they watched in confusion as the strange lump grew... and grew. It suddenly rounded and bulged further, forming a strange oval on either side of her body.
They looked at each other, alarmed, and then continued to observe the strange growths. Between the two lumps, the section of Vipress's body seemed to widen in girth. The lumps grew more pronounced. "Ssslave..." Vipress hissed nervously. "What isssss happening to me?"
"I-I don't know." Brendan stared at her concerned face. "Does... it feel good like before?"
Her reptilian eyes widened as below her gaze the changes continued. The bumps now resembled... shoulders. The widening of her body took on the rough approximation of the top half and chest of a human torso, strange and skinny. Below that, her tail was starting to lose length and reel into her body sickeningly. "Not good." She stared, gasping. "Numb. Cold."
Realization hit Brendan as he vaguely recognized the shape of her changed body. Her shoulder blades widened and the two bumps began to taper off below, into strange tiny tentacles covered with scales. Vipress seemed ready to scream, her eyes wide and horrified at the display.
"You're getting arms, mistress." He carefully probed the growing tendrils of flesh from her new shoulders and watched as they lengthened more and more. Her body was widening, reshaping, morphing into a more human shape. All the while, her mighty tail seemed to be compressing in length, migrating her cloacal slit up further and further.
"Ssslave..." She stared at Brendan, locking eyes with him. "Thisss musst be... from... you." She noticed her distinctive lisp was lessening, and now stared in the same realization as now her upper portion inflated to the approximation of a humanoid chest, though distinctly female in shape. From her shoulders, she watched the tendrils of flesh dangling a good foot and a half in length, gaining more shape as they grew, resembling shrunken upper arms.
"Me?" Brendan quizzed, then realized. "Ohhhh, me!" His cum. Their genetics had apparently... mixed.
Vipress gasped as she kept changing, her body building up into a humanoid shape. She now had an upper torso cinching and curving into a decidedly feminine lower. She had a hint of female curve below her developing waist that tapered into her still long length of tail. Between that section, her slit.
"Thiss is... crazy!" She blurted out, realizing her lisp had almost faded. She stared at Brendan, then shot her eyes to her growing arms, now starting to get elbows and more proportion, then to her changing body. Her tail was getting thicker, much much thicker, and gaining back some length as it stretched out behind her.
Brendan stared in amazement and gently, experimentally, reached out and touched her left "arm." This made the snake jump slightly at the new sensation on a new part of her body.
"This is cool!" Brendan encouraged. "You're turning into a snake woman!"
At that stage, Vipress shot Brendan an angry glare. "Do not forget your place!" She smiled at her complete lack of a speech impediment slyly. Perfect.
He gulped and shrank back. "Sorry, mistress."
"Furthermore!" She pointed her right arm-nub, then stared down at the movement in shock. Below the elbow joint, now her lower arm was growing in. Solid bone was beneath the flesh, stiff, and her jaw fell slack. "I have... arms!" She raised the new appendages into her line of vision, Brendan's admonishment forgotten for a moment, and stared.
Her shape was evening out, finishing up, and she was a strange hybrid human/viper. Her torso, humanoid, was set above her long and now powerfully thick fourteen feet of tail. Above her torso was a foot of neck and then her long sinewy snout. Now her eyes were locked with her new wrist bones, and she sat up, staring, anticipating... her hands.
Brendan gulped, mind elsewhere, as he realized how much bigger and taller she was like this. He stared at the length of her enormous tail, looked up to see her face towering above him, and wondered if she'd be pleased or displeased with the unexpected changes she was getting because of him.