Fanfiction can be a great creative outlet when it adheres to ethical and respectful standards.
First, be aware of the impact of words. Avoid using terms that objectify or degrade others.
Often, there are themes related to protecting the family or the neighborhood. 'Big daddy' might be shown in situations where he has to use his strength and wisdom to overcome difficulties, like dealing with bad guys or handling personal crises.
One common theme is protection. Big daddy is always there to protect little sister. Another theme is loyalty. They are very loyal to each other no matter what they face.
One common theme is the relationship between the Big Daddy and other characters, often in a romantic or sexual context. Another could be the exploration of the Big Daddy's more human side, which is not as obvious in the game. And sometimes, there are themes related to power dynamics.
Well, a common theme is often about self - discovery. The older 'big daddy' might have spent a long time hiding his true self and then finally embracing his gay identity. And in the process, he meets someone who understands him completely. Also, the theme of family - not just biological family but the chosen family within the gay community is often present. They support each other like a real family would, and these 'big daddy gay stories' can show how important that support is.
Adventure is also quite common. They might explore new places or face strange creatures. For example, they could be on a quest to find a lost treasure in the ocean. It makes for an exciting story.
There was a time when a group of friends were joking around about who has the biggest booty. One of them told a story of how she accidentally sat on a small stool and it completely disappeared under her big booty, which had everyone laughing.
I don't have any specific 'big booty fetish stories' to share as such topics are inappropriate and objectifying. However, in general, body positive stories could be about celebrating all body types in a healthy and respectful way.
One common theme is redemption. Snape is often portrayed as finding a new purpose in being a father - like figure, which helps him redeem himself from his past mistakes or his cold exterior. For example, in many fics, he might have been a harsh teacher before, but as a 'daddy' figure, he becomes more understanding.
One common theme is protection. The 'daddy' figure is often there to protect the 'little' one from various threats, whether it's physical danger or emotional harm.