Yes, there are many. You can start by looking on fanfiction.net or Archive of Our Own. Just search for 'anna and kristoff kiss' in the search bar, and you'll find a variety of stories with different plotlines and writing styles.
One possible antagonist could be a power - hungry wizard who wants to take over the kingdom of Arendelle. He sees Anna and Kristoff as threats to his plans and tries to stop them from protecting the kingdom. He uses dark magic to create various obstacles for them.
Anna and Kristoff's wedding was a grand affair. The whole of Arendelle was decorated with ice sculptures and flowers. Anna looked stunning in her white dress, with a tiara on her head. Kristoff was dashing in his suit. As they exchanged vows, there was not a dry eye in the crowd. Sven was there too, with a little flower crown on his antlers. After the ceremony, they had a huge feast and danced the night away, their love finally sealed in marriage.
The build - up to the kiss can be really interesting. For example, if the author creates a lot of tension between Anna and Kristoff before they kiss, like misunderstandings or challenges they have to overcome.
Anna and Kristoff's love story is one of growth and discovery. Anna was on a mission to save her sister and her kingdom. Kristoff, with his reindeer Sven, joined her. In the beginning, they were just two people with different goals but on the same path. As they encountered various difficulties, they relied on each other more. The time they spent together made them understand each other's values and personalities. Anna's courage in the face of danger and Kristoff's loyalty were qualities that drew them closer. Their love story is a beautiful example of how two people can find love while on a journey full of challenges.
One possible plot could be that Anna and Kristoff go on a journey to find a magical flower that is said to have the power to heal any ailment in the Enchanted Forest. Along the way, they face various challenges like wild animals and difficult terrains. They also have to deal with their own relationship issues as the stress of the journey tests their love for each other.
The Duke of Weselton's nephew could be an antagonist. He might hold a grudge against Arendelle for what happened to his uncle. So he tries to undermine the stability of Arendelle by causing trouble for Anna and Kristoff's daughter. He could spread false rumors about her or try to sabotage important events in the kingdom.
Well, there's a fanfic called 'Anna's Discovery'. In this story, Anna discovers a new side of Kristoff that she hadn't seen before. It delves deep into their characters and how they grow together. Also, 'Together Forever' is a popular one. It takes their relationship to a new level as they face challenges in the kingdom and support each other throughout.
Anna could develop more patience as a mother. She was always a bit headstrong, but now she has to be more patient with her kids. Kristoff might become more open about his feelings as he is in a family environment. He used to be a bit of a loner, but now he has to communicate better with his family.