Perhaps Ruby made a decision that Weiss strongly disagreed with regarding a mission objective. Ruby thought it was a good idea to help a group of civilians first, but Weiss believed they should focus on the main target. Weiss would yell, 'Ruby, you're being naive! We can't deviate from our mission just for some strangers!' This would start a heated debate between them, with the other team members having to step in to calm them down.
I'm not really into fanfics that involve such unusual pairings like 'futa'. However, in general, when it comes to RWBY fanfics with Weiss and Ruby, they often explore different aspects of their relationship. If the 'fanus' element is added, it could potentially introduce new storylines related to the world - building of RWBY, such as how the Fanus interact with these two characters.
One common theme is the overcoming of differences. Ruby and Weiss start off with a somewhat rocky relationship in the show, so in fanfics, their kiss might symbolize them getting past those initial disagreements. Another theme could be the discovery of new feelings during a time of crisis. For example, they might be in a battle together and realize their love for each other in that intense moment.
One common theme is friendship. Since Ruby and Weiss are from different backgrounds in the RWBY world, their journey of becoming friends is often explored. They learn to overcome their differences and support each other.
There are some. Tumblr also has a RWBY fan community where people sometimes share or recommend fanfics that involve Ruby and Weiss kissing. You might also want to join RWBY - related forums or groups on social media platforms. Fans often discuss their favorite fanfics there, and you can get some good suggestions. But be aware that not all fanfics are created equal, and some might not match your taste.
There's also 'The Ruby - Weiss Alliance'. This fanfic delves into how Ruby and Weiss team up to solve a mystery within the school. It's full of action and their interactions are really well - written, highlighting their trust in each other.
A great fanfiction plot could be that Faunus Ruby is being discriminated against by some students at Beacon. Weiss, who is used to a world of privilege, decides to stand up for Ruby. This act of kindness makes Ruby trust Weiss more. As time passes, they find themselves relying on each other more and more during combat and in their studies, and a beautiful friendship (or maybe something more) starts to develop.
I'm not sure if there is such specific fanfiction readily available. Fanfiction varies greatly, and while there may be a large body of RWBY fanfiction, this particular theme might be quite rare or not exist at all. It also depends on the various fanfiction platforms and their content policies.
A prevalent theme is the exploration of their relationship. This can range from a deep platonic bond to something more romantic in some fanfictions. Also, the theme of loyalty is common. They are loyal to each other as members of their team, and fanfictions will often have situations where this loyalty is tested, like when one of them is in danger and the other has to make a choice to save them.
One popular fanfic could be 'A New Beginning for Weiss and Ruby'. In this fic, they might go on an adventure together, facing new Grimm and uncovering secrets about their world. It could focus on their friendship and how they help each other grow as huntresses.