Charlie's legs were already trembling by the time they left to drive to their parents house. Before they had left, Jason had slid behind her, his chest brushing her back, his hands tenderly tugging on her hips so the bulge in his pants grazed her ass. The morning was full of teasing as they finished getting ready and loading up. They'd decided that it was a good idea to carpool in his truck to meet their parents, but now she couldn't stop the daydreams from occupying her every thought. When she crawled inside she noted how cold the cab had gotten overnight and she regretted her decision of simply wearing shorts and t-shirt. As Jason hopped into the passenger side he noted the temperature and offered his jacket to her, wrapping it around her shoulders snuggly so she'd warm up.
The cab did warm up quickly as the sun rose fully in the sky. Their parents lived in a little seaside town a few hours away from Charlie's place, so the two settled into the ride, upbeat tunes playing on the radio and the both of them laughing. The atmosphere was unexpected; she had expected to feel awkward this morning, feel ashamed about what they had done the night before, but Charlie honestly didn't have any regrets. She mused about the implant in her arm, debating wether or not to tell him he could have cum inside of her. She shook her head at the thought, although she took the opportunity to fake a shiver and scoot closer to him as he drove. Jason took the hint and casually wrapped one arm around her shoulders scooting her even closer to him.
His bulge was impressive as it pressed up against the gym shorts he had opted to wear, and Charlie decided to take the opportunity, slipping her hand across the waist band.
"Can I take it out?" She purred quietly against his throat and smiled as he gripped the steering wheel tighter, nodding eagerly. She pulled the waist band down and reached in, wrapping her cold fingers around his warm cock; he whimpered, "Do you want me to stop?" She asked looking up at him.
"No, please don't stop." He panted, scanning the GPS to see if there was a pull out or side road anywhere up ahead. She pulled his hot cock out, stroking it gently, pulling the skin back and forth, his arm falling across her back, gripping her shirt tightly. She lowered her head down as he finally pulled over and took off his seatbelt, her lips wrapping around his head and slowly pushing down, as he slowed safely to a park, she forced him further into her throat. Jason moaned as his hand pulled her shirt up, his fingers finding her sensitive nipples, tracing and teasing, making her shudder and moan around his cock. She kept swallowing more of his impressive rod until his curly public hairs tickled her nose and her eyes rolled back in her head. Jason gasped and moaned as he felt her throat eagerly engulf his throbbing cock. He had never experienced anyone taking so much of him, not even Amy.
Charlie worked his rod in her throat, eager to please, it had been a while since she had been able to properly suck a cock and she had to admit she missed the sensation. Pulling back momentarily she took a deep breath, drool hanging from her tongue, clinging to his glistening head. She began to bob up and down again, her tongue twisting around his glands, teasing her sensitive step-brother. He groaned, wrapping his fingers in her hair and gasping as her talented tongue made obscenities fall out of his mouth. Charlie's free hand reached up to delicately grasp his balls, massaging them tenderly, encouraging him to cum for her, she wanted to taste his cum, wanted to feel it slide down her throat. Her pussy was quivering, she could feel her cotton panties soaked, her puffy labia eating them. Cock sucking always did get her aroused, she loved feeling the way his thick rod twitched in her mouth.
She pulled back, smiling up at him and slid herself backwards, Jason groaned slightly but watched her with wide eyes. Her fingers hooked into the belt loops of her shorts and she wiggled them off, her white panties soaked and see through, stuck flatteringly against the gentle slope of her throbbing pussy. His groans turned to gentle, almost pitiful, moans as his eyes took in the beautiful sight before him. She straddled him then, the larger truck allowing enough room for her to do so, his glorious head perched tentatively against her slit, the cool steering wheel against her back. Jason's mouth hung open, his hands clutching her waist, fingers holding onto the thin fabric of her shirt.
"Please..." he whispered breathlessly against her smiling lips. The electricity between them could not be described and he found his whole body trembling, aching for his step-sister's warm embrace, finding himself in absolute dire need of it. She giggled, but found herself unable to deny how badly she wanted him inside of her too. Her lips curled into a hungry smile as she pulled her panties to the side and lowered herself down, gasping and moaning as he filled her up. She felt the same pressure that she had felt last night and she pushed down against it, he groaned and found her lips with his, kissing her passionately as she bounced up and down on him. She pressed herself against him; as his tongue parted her lips and his cock split her insides, she obsessed with the fullness of it all, and was amazed by how badly she still wanted more.
She was getting close, and could tell that he was too. Charlie moaned loudly as she came, a loud gasp that ended in a violent shudder and Jason ate it up, wrapping his hands around her and forcing her down hard on his cock before trying to pull her up so he could cum as well.
"Cum inside me!" She panted, forcing herself back down, continuing to jerk his cock off with her pussy. His eyebrows furrowed in indecision as he looked at her, "I'm on birth control dummy." She teased, a twinkle in her eye. Jason smiled wide before thrusting as deep as he could and exploding, sending torrents of hot cum across her cervix, filling her up completely. They sat there panting, each trying desperately to catch their breath.
"You're gonna drive me crazy this weekend aren't you?" He groaned teasingly, wrapping his arms around her back and holding her close to him.
"I'm gonna try really hard." She murmured back, laying her head on his chest and nuzzling her face into his neck. They sat like that for a while, neither wanting to break the blissful serenity that they were experiencing together. Charlie was the one to break the silence in the end, groaning exasperatedly as his now soft cock slid sloppily out of her, "We're gonna have to stop somewhere with a bathroom so we can clean up," she chuckled as she fell back against the truck's bench.
"Good idea." He smiled and reached for his seatbelt as he watched her wiggle back into her shorts. He checked the GPS, scanning their route for any icons indicating a rest stop, he found one a few miles up the road and slowly pulled back out onto the empty stretch of asphalt.
The drive passed in a blur of happy conversation. Jason told Charlie about his life in Boston, she knew he had been working at some design company but she was surprised to learn just how much she didn't know about her step-brother. He loved design, wanted to be an architect someday, he told her how he had been thinking about going back to graduate school and getting his degree in it. She loved the idea, encouraging him to apply and do something he genuinely loved. Charlie wouldn't admit it out loud, but she almost believed that Amy breaking off the engagement could be the start of a whole new life for Jason, she could see the excitement in his eyes as he talked about the buildings that made him fall in love with architecture, it was enough to make her start to fall in love with it as well.