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Challenge Accepted: When Sibling Rivalry Turns Intimately Explosive

Chapter One: The Bet

Jane and John were sitting on their worn-out couch, sipping on their beers and chatting about their latest love escapades. Jane, the older of the two, was always the more experienced one when it came to relationships and sex. She had a string of ex-boyfriends who she claimed had the biggest cocks she had ever seen.

John, on the other hand, was still a virgin in that department. He had been with a few girls before, but none of them had been willing to go all the way. He shrugged it off and jokingly said, "Maybe it's because of my size. They probably can't feel it like they do with your ex-boyfriends."

Jane playfully rolled her eyes and retorted, "Oh, please. Don't be so sensitive. If you're so curious, why don't we make a bet out of it?"

John's eyes lit up with curiosity and intrigue. "Really? You'd be willing to test that theory out?"

Jane, never one to back down from a challenge, smirked and said, "Why not? I'm always up for a good time."

Without any hesitation, John stood up and stripped off his shirt, pants, and boxers. Jane's eyes widened in surprise as she took in his size. She had to admit, he was bigger than she expected.

John, teasingly, said, "Well, are you going to chicken out or not?"

Jane stood up and retorted, "Shut up. I'm not afraid of a little challenge."

With that, she stripped off her shirt, pants, panties, and bra. She was surprised at her own boldness, but she was determined to see this bet through.

John sat back down on the couch, and Jane straddled him in the missionary position. She slowly put his dick into her pussy, surprised by how deep it felt like he was going inside her.

John grabbed her hips and started thrusting into her, causing Jane to grab his shoulders for support. She asked him, "Are you fucking me because you've never had sex before?"

John, jokingly, replied, "Yes, and I'm making the most of it."

His thrusting started to speed up, surprising Jane. She jokingly told him, "Don't cum inside me, or I could get pregnant."

But John's thrusting only got faster, surprising Jane even more. She could feel herself getting wetter and wetter, and she could tell that John was getting close.

Just as she was about to tell him to stop, John's thrusting reached its peak, and he came inside her. Jane couldn't believe what had just happened. She had just lost a bet, but she had to admit, it was the most exciting and unexpected thing that had ever happened to her.

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