A common theme is the exploration of their age - gap relationship. Tenzin is much older, so there's often a focus on how they bridge that gap. Another theme is the clash between Tenzin's traditional airbending wisdom and Korra's more impulsive Avatar ways.
One common theme is Tenzin learning from Aang. Since Aang was Tenzin's father and also a great Avatar, many fanfictions explore how Tenzin grew under Aang's guidance. For example, Aang teaching Tenzin about airbending techniques or the spiritual side of being an airbender.
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Once upon a time, there was a girl named Lily. She was in a hurry to get to her dance class. As she was running up the stairs to the studio, she accidentally caught her pantie on a nail that was sticking out from the railing. There was a small ripping sound. She was so embarrassed but luckily she had a long shirt on and was able to continue to her class without anyone noticing.
I'm sorry, I don't have specific 'lin and tenzin married fanfiction' to recommend directly. You could try searching on popular fanfiction websites like Archive of Our Own. There might be some creative stories written by fans about their marriage there.
Well, in a 'lin and tenzin married fanfiction', a really interesting plotline could be their journey of self - discovery within the marriage. They might realize new things about themselves through their relationship with each other. Maybe they go on adventures together and during those, they learn more about their love for each other and how they can support one another. They could also have to deal with past traumas or misunderstandings that resurface and they have to overcome them to strengthen their marriage.
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I'm not sure of specific Tenzin x Korra fanfic titles off the top of my head, but you can try searching on fanfiction.net as well. You might find stories that delve into their unique dynamic. Tenzin being an older and more experienced airbender and Korra as the young and headstrong Avatar could lead to some really interesting character - driven fanfic.