Romance can also be a big theme. Writers might explore the relationship between cousland and teagan, how they fall in love, and the challenges they face in their relationship, like differences in social status or family expectations.
You can try searching on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find some great cousland teagan fanfic there.
A common theme is adventure. The Cousland character often goes on adventures involving the Griffin, exploring new lands or facing dangerous foes.
A common theme is the exploration of their relationship's development. Given their different backgrounds in the Dragon Age universe, how they come to understand and care for each other is often explored.
Another theme is family. Many fanfictions explore the male Cousland's relationship with his family, how his family name influences his actions and decisions. It could be about protecting his family's legacy or living up to their expectations.
Adventure and Heroism. Since they are characters in a game world full of quests and battles, many fanfictions incorporate their adventures together. They fight side by side against dark forces, which also strengthens their bond.
Given that Brazzers is an adult - oriented production, it's likely that themes in her 'wife' roles might involve elements of adult relationships such as passion, attraction, and perhaps some relationship drama within the adult - content framework. But again, this is just a general assumption without specific knowledge of the actual content.
The theme of discovery is quite common too. As they travel together, they discover new places, new magic, and new aspects of themselves. It's really interesting to see how the authors play with these themes and how they make the relationship between Cousland and Leliana evolve within the context of these themes in the Dragon Age setting.
In many such fanfictions, if Cousland was betrayed, it could lead to a dark and complex storyline. Alistair might be conflicted. Maybe he was forced into a situation where he unknowingly played a part in the betrayal. The story could explore Cousland's struggle to survive and seek revenge. Their relationship, which might have been one of friendship or more, would be shattered, and both characters would have to face the consequences of this new, tumultuous situation.
There could be a kind old healer in Haven who takes Cousland under her wing and helps her during her pregnancy.
In the 'cousland gets a griffin' fanfic, Cousland might be on a quest when they stumble upon a griffin's nest. The griffin, initially hostile, realizes Cousland means no harm. Cousland then earns the griffin's trust over time. This could lead to them exploring new lands together, uncovering hidden treasures and ancient secrets that were previously inaccessible to Cousland alone.