Another option is Wattpad. Although it has a wide variety of content, you can still find some interesting Glee fanfictions featuring Rachel and Blaine. You may need to do a bit more searching compared to the other two platforms, but it's worth a try.
Another option is Tumblr. There are many Glee fanfic blogs on Tumblr. You can search for tags like #Glee #Blaine #sickfanfiction. Some bloggers also post links to their own fanfictions or recommend ones they've read. However, the search on Tumblr can be a bit more hit - or - miss compared to the other two platforms.
You can find it on fanfiction.net. It has a large collection of 'Glee' fanfictions, including many about Kurt and Blaine.
You can find glee kurt blaine fanfiction on websites like Archive of Our Own (AO3). It has a vast collection of fan - created stories. Just search for 'glee kurt blaine' in the search bar, and you'll get a long list of relevant fanfictions.
Some Glee - focused fan forums might also have threads dedicated to sharing 'glee blaine mpreg fanfiction'. You can join these forums and interact with other fans who might be able to point you in the right direction or even share their own creations.
There's a fanfic called 'Shared Stages'. In this story, Blaine and Rachel are both in New York trying to make it big. They start as rivals but gradually become friends who support each other in auditions and performances. It's a really heartwarming read that shows their growth as characters.
Tumblr can be a source as well. There are many 'Glee' fan blogs that share and recommend fanfictions about Kurt and Blaine. Some Tumblr users even create their own short fanfictions and post them. Additionally, you can try searching on Google by typing in specific keywords like 'glee kurt and blaine fanfiction' along with other elements you're interested in, such as 'angst' or 'fluff' to narrow down the search results.
Fanfiction.net also might have some. However, AO3 usually has more comprehensive tagging systems which can make it easier to find exactly what you're looking for. Another option could be Tumblr, where some users might share or recommend such fanfictions, although it's not as organized as the dedicated fanfiction sites.
Another option is to check out Tumblr. There are often Glee fans on Tumblr who write and share 'Rachel GP Glee' fanfiction. You can search for relevant tags like '#RachelGP #GleeFanfiction' and you might come across some interesting stories. Also, don't forget to explore the blogs of dedicated Glee fans as they might have some hidden gems.
Another option is Wattpad. While it has a wide range of content, you can still find some good Glee puck and Rachel fanfiction. Just be aware that the quality might vary more compared to the other two platforms, but it's still worth checking out.
One popular trope is the 'unlikely friendship'. Since they have different personalities and musical styles in the show, fanfics often explore how they can form a deep and meaningful friendship. For example, in many stories, they start off not getting along but then find common ground in their love for performing.