I'm not sure if there are a whole lot of these fanfictions, but you might want to check out fanfiction.net. Just search for 'Fallout New Vegas Lone Courier x RWBY' and you'll likely find some. Some might be a bit rough around the edges in terms of writing quality, but there could be some hidden gems.
A more complex plot might be that there is a dimensional rift that is causing chaos in both universes. Characters from both Fallout New Vegas and RWBY have to work together to close the rift. In the process, they learn about each other's worlds, values, and fighting styles. The contrast between the post - apocalyptic technology and magic - based abilities in RWBY could lead to some really interesting interactions and story developments.
The redemption trope can be seen too. Maybe the Courier has some past mistakes or a dark history from Fallout New Vegas, and in the RWBY world, they find a chance to redeem themselves. This can be a really deep and emotional trope, as the Courier tries to become a better person while interacting with the more idealistic characters in RWBY.
A third storyline could be them teaming up to take on a powerful raider gang that has been terrorizing the local settlements. As they plan and execute their attacks, they face challenges that test their relationship and loyalty. This could include moments of doubt and conflict that they have to overcome.
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.
Many fanfictions in this crossover focus on the cultural shock aspect. The Lone Courier comes from a post - apocalyptic world full of mutants, raiders, and survival challenges. When they enter the RWBY universe, which has its own set of rules, cultures, and threats, there are a lot of opportunities for humorous and also thought - provoking interactions as the Courier tries to understand and navigate this new world.
Cait from Fallout New Vegas and Yang from RWBY would be a fiery pairing. Cait is tough, strong - willed, and has a bit of a temper, much like Yang. They could have some great sparring sessions where they exchange fighting techniques. Their personalities might clash at first, but they would also learn from each other. Cait could learn about the importance of family from Yang, and Yang could pick up some of Cait's more street - smart survival skills. This pairing would lead to a lot of interesting character development and some really fun and intense scenes.
You can start by looking on fan fiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'New Vegas independent Vegas' in the search bar and a bunch of stories should come up. You can also check out some Fallout - themed forums where fans might share their own fan fictions or recommend others.