I'm sorry, but without more specific information about Manuel and Silvana, I can't tell their full story. There could be many Manuels and Silvanas with different stories.
The main theme could potentially be about the journey of the character named Swami. It could explore his personal development, relationships, and how he navigates the world around him. For example, if it's set in a particular cultural or historical context, the story might revolve around how Swami adapts to the norms and challenges of that time.
I'm not sure specifically as I haven't heard of a particular 'swami sex story'. It could be a fictional or perhaps a misnamed or inappropriate reference. There may be many stories with the word 'swami' in them, but without more context, it's hard to define what this one is about.
Since we don't have a clear idea of what the 'Juan Manuel King story' is, it's hard to say its significance. However, if it's a story about his fight for justice, then its significance could be in inspiring others to stand up for what is right. If it's a story of his scientific discovery, it might be significant in the field of science.
There's no definitive information indicating that Lin Manuel Miranda reads fanfiction. While he is very engaged with his fans and the fan culture around his works, whether he delves into fan - created fiction specifically remains unknown.