Yes, there are some. You can start by looking on popular fanfic platforms like Archive of Our Own. There, you might find various stories exploring the relationship between TFA Megatron and Orion Pax. Just use the search function with the relevant names.
Fanfiction.net is another option. It has been around for a long time and has a wide range of Transformers - related fanfics. Just use the search bar to look for the specific pairing.
Pax is to some extent realistic fiction. It portrays characters and events that are plausible and draw from real-world experiences, but it might use literary devices and imagination to enhance the storytelling.
Pax could potentially be historical fiction. It often involves a blend of real historical settings and fictional characters or plotlines to create an engaging narrative that offers insights into the past.
I think 'Pax' is realistic fiction. It presents a story that is grounded in reality, exploring common human experiences and challenges through fictional characters and events. The author's detailed descriptions and the way the plot unfolds make it feel very much like something that could happen in real life.
K-Pax is purely fictional. It was written as an imaginative tale and not based on any real events or people. The plot and characters are the product of the author's creativity.
I'm not entirely sure specifically what 'pax realistic fiction' is without more context. But generally in realistic fiction, the stories are set in the real world, or a world very much like ours. So perhaps 'pax' is related to a particular theme, like peace (since 'pax' can mean peace in Latin). Maybe it's a collection of stories that explore how people find peace in difficult real - life situations.