There might be themes centered around a specific genre like a science - fiction setting. For example, they could be on a spaceship and the male's physical feature and the futa's unique qualities play into the story. It could also be a story set in a post - apocalyptic world where they have to rely on each other to survive and their relationship evolves from there.
First, you need to come up with a basic plot. Decide if it's going to be a love story, an adventure, or something else. Then, create your characters. Think about their personalities, backgrounds, etc.
A 'big dick morph story' could potentially be a fictional or fantasy story where a character undergoes some sort of transformation related to having a large penis. However, this is a rather vulgar and inappropriate concept in most contexts.
Well, a 'big dick reaction story' might refer to a narrative where a character has a strong response to a situation that is somehow related to the idea of 'big' in a non - literal sense, like a big opportunity or a big mistake. But this is just speculation as the term is rather ambiguous.
I'm not sure specifically which 'big dick story' you're referring to. There could be various stories that might use this phrase in different contexts, such as in some tall tales or just as an expression in a made - up anecdote.
I have no idea who 'big dick randy' is in the story as I don't know the story itself. It could be a made - up character for a humorous or specific - themed story.