I think such a theme is quite rare and perhaps not in line with typical story genres. You might have better luck exploring more conventional and positive storylines.
Yes. The Colosseum in Rome is a very large and imposing structure. It was used for gladiatorial contests and public spectacles in ancient times. Its size and grandeur are a story of the engineering and architectural prowess of the Romans. It's like a 'big' story in the history of architecture.
On the farm, there is often a big rooster that is the king of the yard. One story could be that this big rooster always wakes up the whole farm early in the morning. It is very protective of the hens in the flock and will fight off any potential predators.
In the animal kingdom, peacocks are known for their large and beautiful tails which can be considered a kind of 'big' feature. The male peacock spreads its large tail feathers during courtship displays to attract females. This is a story of how a species uses a large physical attribute for mating purposes.
Common themes could include forbidden attractions, breaking societal norms, and perhaps exploring the boundaries of personal preferences. However, this kind of content may not be suitable for all audiences and can be quite sensitive.
These kinds of stories often focus on unconventional sexual preferences and might explore themes of taboo or adventure. But it's a rather specific and niche topic.