The sun beat down on the car's roof as we cruised down the bumpy highway, the radio blasting classic rock tunes to keep us entertained on our long road trip to the beach. I glanced over at my little sister, who was sitting in the backseat next to me, her bathing suit already on in anticipation of our arrival. I couldn't help but feel a little uncomfortable as I watched her fidget in her seat, her toned legs shifting restlessly.
"Hey, can you stop doing that?" I snapped, trying to keep the edge out of my voice. "You're pressing against my lap."
She looked at me with a mix of confusion and embarrassment, her cheeks flushing a deep pink. "Oh, I'm sorry. I didn't mean to."
But as the car hit another bump in the road, she accidentally pressed against me again, this time with a little more force. I couldn't help the gasp that escaped my lips as I felt her body press against mine, my dick twitching in my swim trunks.
She looked at me with wide eyes, her mouth forming a small "o" of surprise. "I-I'm sorry," she stammered, scooting away from me as quickly as she could.
But the damage was already done. As the car jostled us around, I could feel myself getting more and more aroused, my dick growing harder with every bump. I tried to think of anything to distract myself, but it was no use. I could feel her twat getting wetter and wetter, and I knew she was feeling the same thing.
She tried to play it cool, but I could see the curiosity in her eyes. She had never experienced anything like this before, and I couldn't help but feel a little guilty for getting her all worked up.
But as the road got bumpier and bumpier, I could feel myself losing control. I could feel her grinding against my dick, even though she knew she shouldn't. I tried to stop her, but I couldn't help but get caught up in the moment.
"We shouldn't be doing this," I muttered, my voice barely above a whisper.
"I know," she replied, her own voice breathless. "But I can't help it. I've never felt anything like this before."
And with that, I lost all control. I started to thrust my hips, even though I knew it was wrong. She moaned and gasped as I filled her up, her twat clenching around my dick as I pounded into her.
I could feel myself getting close to the edge, but I didn't want to cum inside her. I knew it was wrong, but I couldn't help it. I exploded inside her, filling her up with my seed.
I pulled out, and she looked down at the mess we'd made. She couldn't help but feel a little disappointed that it was over.
"I'm sorry," I said, my voice barely above a whisper.
But she just smiled at me, her eyes sparkling with excitement. "Don't be. I can't wait to do it again."
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