His sister sure is hot

Parker was breathing heavily, his skin feeling itchy, though not from sweat. He was horny as hell, really he had been since they started dancing at the club. When the fucking had started, the only thing keeping him from joining in was his sister pulling him away. He could feel a burning in his chest too, one that was getting worse and worse. And Rachel wasn't helping, her small dress accentuating her runner's body, especially her long legs that he had noted but never really appreciated until now. Her dirty blonde hair, same as his, was slightly disheveled from their run and framed her slim face and brown eyes.

"I wonder what she looks like in between them," he thought, licking his lips.

"Parker, what the hell?" he heard Rachel ask. He blinked and saw that they had somehow ended up chest to chest with her back pressed against the large cooler he had grabbed the water from just a minute ago. "Parker, let go of me. What are you doing?" she said, nervousness slipping into her voice. He had her arm in his hand, gripping her wrist tightly. Fear flickered in her eyes as his grip tightened. "Parker?"

Parker wasn't really sure what was happening to him, but he knew he had his very attractive sister pressed against the wall and the look she was giving him turned him on immensely. Slowly, he reached for her other arm, squeezing it in his grip and pressing it to the door above her head along with the other one. Fear flashed in her eyes again and Parker knew what he wanted.

He dropped one of her arms, moving his hand to her throat and squeezing lightly. Rachel's eyes bugged out of her head, her stomach awash with fear at the unhinged look in her twin brother's eyes. "Parker, what are you doing? You're hurting me," she gasped, her air supply being cut off. Parker was breathing heavily now, his shirt clinging to his chest.

"So hot..." he mumbled, pulling lightly at his thin shirt. The fabric tore around his finger, revealing more of his chest. Rachel gasped again as Parker's fingers blocked the blood flowing to her brain, making her light-headed. "You're so hot, Rachel." Parker's other hand wandered her body, squeezing her flesh with enough **** to make her squirm, finally landing on her hip.

Rachel's vision was tunneling when Parker's hand left her neck, sending fresh blood to her brain. She gasped, reeling, before her brother's hand went back into place, constricting her neck again. It was only when she felt something hot and hard against her bare leg that she realized what had happened. She was helpless to react as her twin brother **** his dick inside her underwear and into her pussy. She was helpless to scream or cry, everything feeling distant thanks to her barely conscious state. She knew she was being fucked by her brother in the middle of a gas station, but within her mind, that hardly seemed important.

Parker, meanwhile, was completely consumed by the virus. He didn't know what inspired him to pull his cock out, but his sister had looked ridiculously wanton and fuckable in the moment. Who was he to not oblige her and give her the dicking she deserved? He moved inside her with relish, no longer considering her his sister, but just another hole to fuck. He came quickly, the virus' slow influence on his body giving him a short fuse. He erupted into the slut he was fucking, letting go of her neck to properly hold her hips and **** more of him inside her.

Rachel had been a passive observer in her own violation, the entire thing almost feeling like an out of body experience, until her brother's hand suddenly left her neck. Immediately, her circulation increased as fresh blood flooded into her brain. Reality came crashing back and Rachel's body assaulted her with a sudden burst of feeling as her brother's cum filled her tight cavity. Her eyes went wide as she instantly came, a rush of hormones instantly taking her over the edge. The virus tagged along for the ride, immediately saturating her mind and spreading its influence. Rachel was fully infected and orgasming before she even had a chance to consider what was happening.

Her eyes crossed and her tongue flopped out of her mouth as she was overwhelmed with the sensation of being rutted. The virus worked over her, hollowing out her brain as her tits filled with new flesh. They burst out of her tight dress, the fabric never designed to hold such enormous assets. The hem of her dress slid up as he hips and thighs expanded outward, becoming perfect handholds for anyone using her. The only thing left in her mind was to serve her new master however he asked. Her vacant eyes staring up at her brother, who had gone through his own share of transformations. Parker had gained height and mass, his shirt strained to transparency trying to contain his larger figure. Two leathery appendages hung from his forearms, their tips flared like whips, perfect for subjugating his new ****. Though one sex slut wasn't enough for him. And fortunately, there was another easy target nearby.