Debra turned to run and something happened in Gwen's mind. It was as if a fog clouded her thoughts and some new animal instinct took over. She flicked her wrist towards the retreating scientist and a thick black fluid shot out, arcing across the room and entangling her feet together. Debra tumbled to the ground in a heap and screamed. Gwen crouched and sprang, leaping a full thirty feet across the room in one leap. In an instant she was crouched, her legs straddling Debra's prone body.Gwen looked down and smiled at her, her lips parting slightly to reveal her sharp fangs, dripping with venom.
Looking up Debra stared at Gwen's face. Her expression was barely human, the thing the young girl had become was looking at her as if she was one thing and one thing only, prey. Gwen's mouth opened wider,unnaturally wide, and a second pair of fangs extended from her lower jaw. Then with a snap of her head Gwen buried her fangs into Debra's neck, drinking her blood and pumping her venom at the same time. As she drank the fluid continued to spray from Gwen's wrists, covering Debra's body with a strange black cocoon.
Gwen sat back raised her head to the roof and hissed loudly. Suddenly her mind snapped back into focus. She looked down at the cocooned body of the beautiful scientist and started shaking. What had she done? What was she becoming? She scuttled backwards away, her fingernails clicking loudly as they impacted the stone floor. Gwen was in shock, she’d killed the woman, and she’d loved it. The feeling of power, the taste of her flesh, it all sat in her mind not as a regret but a strange dream-like memory that she wanted to experience again. As Gwen reeled, her hand came to rest on her inner thigh. Almost independently of her thoughts it started snaking up her thigh, lifting the short dress up to expose her dripping pussy. The sight of the curvaceous form of the cocooned woman was turning Gwen on like nothing before. Gwen let her fingers slip inside and slowly worked herself to orgasm,all the while crawling back towards the cocoon, the shock on her face replaced by a wicked grin.
She placed her spare hand on the cocoon and felt movement inside. Whatever she had done had not killed Debra, she was alive and filled with Gwen’s venom. Gwen swore she heard moans of pleasure from inside. The spider had passed something on to her and now she’d passed it onto Debra. Would she become like Gwen? She had no idea, but whatever was happening to Debra would take a while and Gwen didn’t want the cocoon found in the meantime. She took it under her arm, easily lifting the full weight, and moved it into a storage room just off the main lab, filling the lock with a squirt of her strange sticky emissions. That would have to do.
With the cocoon gone Gwen started to calm down. The feelings of arousal had faded. Gwen wondered if it was the cocoon itself that was causing her arousal. Was it giving off something to make her feel protective about it? She sniffed at the tiny slits in her wrists where the webbing had shot from and immediately her knees buckled under her as a massive wave of arousal flushed through her loins. She mashed her new tits together and moaned. It felt so good. It was definitely the webbing, it must contain some kind of incredibly potent aphrodisiac. Gwen’s stomach suddenly rumbled loudly.She rubbed it with her hand.
“Wow, I must have drunk too much,” she said out loud. Any revulsion with what she had done had already faded as if drinking Debra’s blood was the most natural thing in the world. Gwen’s new instincts were ruling her,rational thought came a distant second to her body’s needs. Right now her instinct was to sleep, somewhere dark and where she wouldn’t be undisturbed. She was about to make for the door when she noticed an open window. She glanced down at her wrist, wondering. Just as she was about to fire a bolt of webbing out the window she remembered why she had come to the lab in the first place.
The idea of curing herself was fading from her mind. Why should she give up her new found strength? Feeding had made her feel so good and her pussy was still wet from the smell of the webbing. Whatever the spider had done to her she would kill to keep.
A click interrupted Gwen’s thoughts. Then another. Gwen’s head snapped around, her pitch black eyes instantly homing in on the sound. The massive spider that had bitten her was tapping on the glass of its tank.
“Oh, you. I’d forgotten about you. My maker. I can’t let them cut you up can I now? And besides, I might need more of your venom. You,my dear, are coming with me.” She walked over to the tank, her newly perfect butt swaying with each step. Reaching in, she let the spider climb her arm and take a place on her shoulder. Gwen reached up and gently stroked it, loving the feel of the smooth hard carapace. For a second she caught her reflection in the glass of the tank. The black eyes that stared back at her were huge, maybe twice the size they had been! The blackness seemed to be spreading. Black tendrils were flowing out from the edges of her eyes, making her look like she was wearing thick makeup. The lines of venom contrasted against the almost pure white of her perfect smooth skin. The day before this would have terrified her but now Gwen just stared in fascination at her new visage. Her mouth parted slowly to reveal a pitch black tongue. She licked her dark lips, leaving a glossy shine. With the sunglasses back on her head, not quite hiding all of the changes, but enough not to raise too any questions she turned and with a flick of her wrist a thin line of webbing flew out of the window, quickly followed by Gwen and her dark passenger.