I'm not sure if there is a specific 'glee kurt cheats on blaine fanfiction' that is considered 'worth reading'. Fanfiction can vary greatly in quality. Some might find such a plotline interesting because it adds a new layer of drama to the relationship between Kurt and Blaine. However, others might be turned off by it as it goes against the positive image of their relationship in the original show.
A popular fanfiction is 'Nine Years: A Kurt and Blaine Retrospective'. This fanfic is more of a collection of vignettes that look at different moments in their nine - year relationship. It's great because it allows the reader to dip in and out and still get a full sense of their journey together.
You can find 'kurt meets blaine fanfiction' on platforms like Archive of Our Own (AO3). It has a vast collection of fanfictions related to various fandoms, including Glee (where Kurt and Blaine are from). There are filters you can use to specifically search for stories about their meeting.
One great 'kurt meets blaine fanfiction' is 'A Chance Encounter'. It beautifully depicts their first meeting in a really heart - warming way. The author focuses on their initial awkwardness which gradually turns into a deep connection.
Fanfiction can be quite diverse, but this idea of Burt knowing about Kurt and Blaine having sex is a rather risqué concept. In general, most fanfiction focuses on more positive aspects of character relationships, like friendship, love, and growth. While there may be some edgier works that touch on more adult themes, it's difficult to say for sure if there's a fanfiction specifically about this. It also goes against the family - friendly nature that some shows or fandoms try to uphold.
One reason could be to add drama. The relationship between Kurt and Blaine was a major part of 'glee', and introducing a cheating plot would create a lot of tension and conflict, which can make for an interesting story.
Love is a major theme. Their relationship over the nine years is often explored in terms of how their love deepens and changes. Another theme is growth. We see them grow as individuals and as a couple, like how Kurt becomes more confident in his career and Blaine matures in his own ways.
In such a fanfic, one possible consequence could be Kurt feeling extremely hurt and betrayed. His self - esteem might take a big hit, leading to him withdrawing from Blaine and their social circle for a while.
One way could be through honest communication. Blaine could come clean about why he cheated, and Kurt could decide to forgive him after a long heart - to - heart. They might then go to couple's counseling to rebuild their trust.