You can start by looking on fanfiction websites like Archive of Our Own. There are often a lot of Vocaloid - related fanfictions there, and you might be able to find some great kyo x yuu ones.
Another place to search is on Tumblr. There are many Vocaloid fans on Tumblr who create and share fanfiction. You can use the search function to look for kyo x yuu Vocaloid fanfiction, but be aware that the quality can vary.
One interesting kyo x yuu vocaloid fanfiction could be about their adventures in a virtual music world. They might collaborate on a song that has magical effects on the Vocaloid universe.
Websites like Archive of Our Own (AO3) are great places to start. It has a large collection of fanfictions, and you can easily search for yuu x mika ones. Just type in the relevant tags and you'll get a list of stories.
You can find yuu x asuramaru fanfiction on some popular fanfiction websites like Archive of Our Own. There are often many different takes on their relationship there.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of different fanfictions, and you're likely to find a good number of kyo x yuki ones there. Another option is FanFiction.net.
Some smaller, more niche fanfiction communities or forums dedicated to the fandom that Kyo and Megumi belong to might also have some great finds. You can search for relevant forums through search engines and then look for the fanfiction section within those forums.
You can start by looking on fanfiction.net. It has a large collection of fanfics, and there are likely many good 'shinoa x yuu' ones there. Just use the search function and type in the relevant tags.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you can easily search for 'yuu x mika fanfic' using the search bar. There are different genres and ratings available.
Well, Tumblr can also be a good source. There are many fanfiction writers who post their works there, sometimes in a more serialized or snippet - like form. You might need to use the search function and look for relevant tags such as '#owari no seraph', '#asuramaru x yuu'. Additionally, some dedicated 'Owari no Seraph' fan forums may have fanfiction sections where you can find some great stories about Asuramaru and Yuu.
Archive of Our Own is a great place to start. It has a large collection of fanfictions, and you can easily search for Mika x Yuu Yaoi stories.
Archive of Our Own (AO3) is a good place to start. It has a vast amount of fanfiction, and you can use the search function to look for Mika x Yuu mpreg specifically. Just type in the relevant tags and see what comes up.