I'm not really into that kind of lemon - filled fanfiction. However, generally, such fanfictions might explore a more romantic or even spicy relationship between Trunks and Bulma. But it's important to note that a lot of this type of content might not be in line with the original spirit of the Dragon Ball series.
One idea could be a story about Bulma's inventions and how Baby Trunks gets involved in her experiments. For example, he could accidentally activate a device that sends them on an adventure through time or to a different dimension.
One idea could be a story where Bulma invents a new device to help Baby Trunks train more effectively. For example, she creates a gravity simulator that allows him to train in conditions similar to different planets.
Some common themes could be family bonds. Since Bulma is Trunks' mother, stories might explore their relationship within the family dynamic. Another theme could be adventure. Given their association with the Dragon Ball universe which is full of action and adventure, fanfics might have them going on quests together. Also, character development is a likely theme, showing how Trunks grows up under Bulma's influence or how Bulma matures as a mother over time.
Definitely include Whis. His knowledge and his ability to train Goku can be a great plot point. Beerus, the God of Destruction, can also be included. His temper and his power can create high - stakes situations in the fanfiction. Additionally, Chi - Chi could be added. Her possessive love for Goku can create conflict when it comes to Bulma's friendship with Goku. And Future Trunks is another character that can bring a sense of mystery and urgency to the story with his knowledge of future events.
No. In the official 'Dragon Ball' story, Vegeta is Trunks' father. Fanfiction might play with the idea for creative or alternate universe purposes, but it goes against the original lore.
One pairing that pops up is Goku and Chi - Chi. Their relationship as husband and wife can be explored further in fanfiction, especially in scenarios where Goku's Saiyan nature clashes with his family responsibilities. Additionally, Trunks and Future Mai is a pairing that has some popularity. Their relationship in the future timeline and how they support each other can be the focus of some great stories.
One possible fanfic could be about Bulma and Young Goku's first adventure together. It might start with Bulma recruiting Goku to find the Dragon Balls. They could face various challenges like wild animals and bad guys along the way. Their different personalities, with Bulma being smart and resourceful and Goku being naive but strong, would create interesting interactions.
A story could be that Bulma discovers a new power - related technology. She wants Goku to test it out. Goku, being always up for a challenge, agrees. At first, he has a bit of trouble getting used to it as it's different from his usual ki - based powers. But with Bulma's patient explanation and his own determination, he masters it and they use it to fend off a new threat to the Earth. Their bond grows stronger through this experience as they learn to rely on each other in new ways.
Well, such sex fanfiction is not common and can deviate from the intended themes and characters of the original series. It's better to enjoy fan creations that enhance and expand the story in a meaningful way.