Some RWBY fanfiction communities on Discord might have a collection of suitable Ruby and Blake fanfictions. You can join these communities and ask for recommendations. They usually have rules against sharing inappropriate content, so the suggestions you get are likely to be clean. You can also look for fan - made RWBY anthologies that might include some great stories about Ruby and Blake that are appropriate for all audiences.
One great place to find non - inappropriate RWBY Ruby and Blake fanfiction is Archive of Our Own (AO3). There are many well - written stories that focus on their friendship, adventures together, or character development. You can filter the search to exclude any mature content. Another option is FanFiction.net, though you need to be more careful with the search and read the tags and summaries carefully to ensure it's appropriate.
I'm not sure about specific fanfictions but you could try searching on Reddit's RWBY subreddit. Fans there often share and discuss their favorite fanfictions. They might be able to point you to some great Ruby and Blake stories that are family - friendly. Also, following RWBY fan groups on social media platforms like Twitter or Tumblr could lead you to some good, clean fanfiction finds.