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May firmly gripped the door handle. She might find help in there, and she needed all the help she could get. Even if there was bad news behind the door, she could slam it and run away, which would hopefully disinterest any zombies from following her.

May grasped the umbrella tightly as she turned the door handle and swung the door open. In some ways, she was surprised to find what she did. But at the same time, she knew this a possibility.

This was Pete's younger sister's room. May had gotten to know her quite well during her relationship with Pete, as they were basically the same age and she'd often hang out with her when Pete was busy. And Pete was often busy. It seemed she was busy right now as well, May saw the back of his semi-muscular naked body standing at the foot of the bed, thrusting in and out of his sister, who was lying, eagle-spread out on her blue-and-white duvet (which was the only cloth touching her body) with a dazed, cross-eyed expression, evidently not a thought in her head.

So May stood there, watching her ex have his way with her friend. May began to close the door, and winced as it let out a small creak. She looked up at Pete, who had now stopped what he was doing and had turned his head, and his blank, white eyes locked with May's.

Instantly, May felt her brain turn to mush. She felt the grip on the door handle slip and heard the umbrella clatter to the floor. No one reacted to the sound however, May was too focused on the soft feeling of arousal growing from her pussy. She felt as if her brain was leaking out of her ears, but she didn't mind. It felt good to not think; it feel good to obey. A dumb smile crossed May's face as this final thought left her, and Pete's pheromones took over. She shuffled towards Pete, and stopped once she felt his rock-hard cock press against her shirt.

The zombie Pete grabbed May's shirt and tore it in two, eager for her naked body. His naked sister, sensing her brother's desires, walked to May, and pulled down her shorts and panties, exposing her dripping pussy. With one final motion, Pete removed her shirt and bra, leaving her naked like them. Satisfied, Pete grabbed May and pulled her onto the bed before falling on top of her. He forced his mouth onto hers, and May began to moan as she reciprocated his action, her tongue blindly moving into his. His hands moved onto her chest and fondled her tits, as they moved around unpredictably.

Eventually, Pete broke from the kiss. As the pair stared into each other's eyes, panting, Pete grabbed May's hips and found her pussy entrance with her cock. He thrust into her, and May let out a moan and her eyes lost focus. Pete started to thrust in and out of her, leaving both of them in an absolute state of pleasure. Pete began to pant as his cock throbbed, and May let out one moan after another as her body filled with pleasure. She knew it wouldn't be long before she would cum, and become fully infected like Pete. In her current state, it was what she wanted more than anything. No thoughts, decisions or brainpower, just the primal urge to fuck and cum.

May realised that a wet pussy was slowly lowering itself onto her face. A smile broke across her face as she reached for her friend, and pulled it down onto her. She began to kiss and lick the flowing vagina, sensing her partner's equally desperate desire to cum. The three young adults' fucking grew more and more intense; Pete's thrusting grew quicker and quicker, and May began to lick more furiously as she gripped the ass on top of her. All three had devolved into loud, uncontrollable moans, begging for the sweet release of cum.

It was Pete who gave in first. He let out a deafening moan as white, sticky liquid erupted from his cock and into May's pussy. In turn, the feeling of being filled triggered May's own orgasm. She shook uncontrollably as her body was overtaken by jolts of mind-breaking pleasure and her pussy pushed against Pete's cock. As she shook, May could also feel liquid flow from her nipples as they also began to throb with pleasure. She moaned as loud as she humanly could, the feelings so intense May felt as if she would die when the pleasure faded. After several minutes, when one final blinding jolt of arousal left her, May bit down on the piece of soaked skin in her mouth. The resulting jolt of pain triggered one final orgasm, and May felt the pussy slide from her face as the bed continued to shake from the other girl's orgasm. May began to giggle as the infection took hold, and Pete's control faded, replaced by her own primal instincts to fuck. Her eyes matched Pete's; a blank white.

May bolted up and rushed to her friend, who was still cumming and shaking on the bed. The same clear liquid was flowing out of her breasts, and May wasted no time in pushing her face onto a boob, and beginning to drink the liquid. Each suck sent a jolt of pleasure through May,, and she began to moan. Pete took note, and rushed to copy May. The three of them continued to moan until the orgasm subsided, and there were three blank-eyed zombies staring at each other, giggling.