Where can I find ruka x hayate fanfiction?

You can try fanfiction.net. It has a large collection of various fanfictions, including those of ruka x hayate. Another place is Archive of Our Own (AO3). It's known for its wide range of fan - created works and has a good number of ruka x hayate stories as well.

The two main places to look for ruka x hayate fanfiction are FanFiction.net and Archive of Our Own. FanFiction.net has been around for a long time and has a huge database. It's easy to navigate and find stories. AO3, on the other hand, has a more inclusive and diverse collection. It also allows for more detailed tagging and filtering, which can be really helpful when you're specifically looking for ruka x hayate fanfiction. You could also try checking out some anime forums where fans might share their own written fanfictions, but the quantity might not be as large as on the two main platforms.