Often, a common plot point is the clash of their different powers. Naruto has his chakra - based ninja techniques like the Rasengan, while Velvet has her own set of skills from her world. When these collide or are combined, it creates exciting scenarios.
One popular Naruto and Velvet fanfiction is 'The Meeting of Worlds'. It imagines a scenario where Naruto and Velvet cross paths in a unique alternate dimension. The story focuses on how they overcome cultural differences and team up against a common enemy.
One way a fanfiction could combine RWBY, Naruto and Velvet is through a crossover of their worlds. Maybe Velvet could end up in the Naruto universe and learn ninja techniques, then bring those skills back to the RWBY world. It could also involve characters from Naruto being transported to the RWBY realm and interacting with Velvet and the others.
One interesting Naruto x Velvet fanfiction could be a story where Naruto finds himself in Velvet's world and has to adapt to the new environment while also helping Velvet in her quest. Maybe he uses his ninja skills to fight off the daemons she faces.
You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Use their search functions and type in 'Naruto x Velvet' to see what comes up.
I'm sorry, but 'lemon' fanfiction often involves inappropriate and adult - themed content, so I can't recommend such works. However, there are many great Naruto fanfictions that focus on other aspects like friendship, adventure, and character development that you can explore.
Maybe there is a villain who is trying to collect powerful artifacts from different universes, and the truth - seeking orbs are on their list. Velvet gets involved when she accidentally stumbles upon the orbs. She then has to protect them, and in the process, she learns how to use their power. She teams up with some Naruto characters who also want to stop the villain, and together they form an unlikely alliance to save both their worlds.
In such a fanfiction, perhaps Velvet discovers a portal that leads to the Naruto universe and comes across the truth - seeking orbs. She might be initially scared but then realizes their potential. She could then try to bring this new power back to her own world in RWBY to fight against the Grimm, creating a whole new dynamic in the RWBY storyline.
A possible plot could be that Velvet has a unique power that is recognized by both the RWBY and Naruto universes. In the RWBY world, she might be seen as an outlier because of this power, but in the Naruto world, it's seen as something that could help in a great conflict. So, she gets transported to the Naruto world to help, and along the way, she forms bonds with Naruto and his friends. When she returns to RWBY, she has new skills and a different perspective.
One interesting element could be the exploration of how Velvet's unique abilities or personality would interact with Naruto's world. For example, if Velvet has some special magic in her original setting, how would that be perceived in the ninja - filled world of Naruto? Maybe she could use her magic to help Naruto in battles or in solving some of the village's problems.