One great New Vegas independent Vegas fan fiction is 'The Courier's Redemption'. It follows the courier's journey after the main events of the game, exploring their moral choices further. Another is 'Vegas Under Siege' which creates a new threat to the city and shows how the characters from the game deal with it. There's also 'A New Dawn in New Vegas' that focuses on rebuilding the city in a unique way.
I'm not aware of any so - called 'famous crazy vegas sex stories' that are appropriate to share in detail. Vegas is known for its entertainment, gambling, and nightlife, but focusing on inappropriate stories isn't the best way to represent the city.
The possibilities are endless. It might be that a character has a chance meeting with a long-lost friend in Vegas, or gets caught up in a high-stakes business deal. The events in the novel could range from the exciting to the unexpected.
Well, maybe the main character had a life-changing encounter, or there was a big heist that took place. It all depends on the specific novel and its plot.