Fanfiction.net is also a good place to start. It has been around for a long time and has a vast number of Harry Potter fanfictions. Navigate to the Harry Potter section and then use the search bar within that section. You might need to sift through a few results, but chances are you'll find some fics where Sirius tells Harry he loves him.
Another option is Tumblr. There are many Harry Potter fanfic communities on Tumblr. Some users post links to their favorite fanfics or even write short ficlets themselves. You can search for relevant tags such as #SiriusHarry #love #fanfic and see if you can find what you're looking for.
You can try looking on popular fanfiction websites like Archive of Our Own (AO3). There is a large collection of Harry Potter fanfics there, and you can use the search function to specifically look for fics with this theme. Just type in relevant keywords like 'Sirius', 'Harry', and 'love' to narrow down your search.
You can start by looking at popular fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of Harry Potter fanfictions, and you can use the search function to look for stories with the specific plot of Harry telling Hermione he loves her. Another option is FanFiction.net, which also has a large number of Harry Potter - related fanfictions. Just be sure to read the tags and summaries to find the ones that match what you're looking for.
There could also be a theme of redemption in some fics. Sirius might feel that he has let Harry down in some ways, and by telling Harry he loves him, he is trying to make up for lost time. This could be intertwined with the idea of second chances and the power of love to heal past wounds, both for Sirius and Harry.
Finding such a specific fanfic can be quite a challenge. You could start by looking on major fanfic websites like Archive of Our Own (AO3) or Fanfiction.net. However, not all fanfics are available on every platform, and it may also depend on the popularity and legality of the work.
You can try fanfiction.net. It has a large collection of Harry Potter fanfics, and there's a good chance you'll find some 'sirius teases harry fanfic' there. Just use the search bar and type in the relevant keywords.
You can try some popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for 'Harry and Sirius' fanfic using the search bar. There are different tags and filters to help you find exactly what you want, whether it's a specific genre like adventure or a certain rating.
Another option is Wattpad. Although it has a more diverse range of content, there are still some 'harry loves viktor' fanfics. The advantage of Wattpad is that it often has more interactive features, like comments from the authors and other readers, which can enhance your reading experience.
Fanfiction.net is also a place to look. It has been around for a long time and has a large number of fanfics. However, the tagging system might not be as refined as AO3, so you might have to do a bit more searching. But it's definitely worth a try for finding 'vernon loves harry' fanfics.
You could try searching on popular fanfic websites like Fanfiction.net or Archive of Our Own (AO3). These platforms have a large collection of Harry Potter fanfics and there's a good chance you'll find it there.
Fanfiction.net is also a good place. Many fans post their 'Sirius Harry fanfics' there. However, the site's interface might be a bit old - fashioned compared to AO3, but it still has a wealth of content. Just be sure to use the search function to narrow down your search to the specific type of fanfic you want.
Some independent fanfiction blogs also host such stories. However, they can be a bit harder to find. You can start by searching for Harry Potter fanfiction blogs through search engines. When you find some, check if they have a search function on the blog itself and look for the 'harry gets sirius a trial' fanfiction there.