Well, a Twilight fanfiction centered on his personal assistant could also be a love story. The personal assistant could fall in love with one of the main Twilight characters, like a vampire. Their relationship would be complicated by the fact that the vampire has their own set of rules and a different way of life. It would be a story of two different worlds colliding through the connection of the personal assistant.
Obviously, Twilight would be one of the main characters. She could be a young and inexperienced Twilight who needs a lot of guidance from her personal assistant. And the personal assistant could be a mysterious figure with some unknown past. Maybe they have some special abilities like being able to communicate with animals which can be very useful in Twilight's world.
Maybe the personal assistant is from a different dimension and has to adapt to the world of Twilight while also using their unique skills to protect her. They could encounter various magical creatures together and the assistant has to learn the magic of this new world quickly to keep Twilight safe.
In many fanfictions where Bella is Edward's personal assistant, it often leads to interesting relationship dynamics. They might start off in a professional relationship but gradually develop deeper feelings. For example, Bella could be tasked with managing Edward's busy schedule, from business meetings to social events. As she gets closer to him, she discovers more about his true self, and he in turn is drawn to her unique charm and efficiency.
My personal assistant once misinterpreted my command to play some 'relaxing music' as 'waxing music'. It started giving me information about hair removal salons. I couldn't stop laughing at how wrong it was.
One horror story is when a personal assistant misinterpreted a voice command. A user said 'call mom' but it called the wrong number which happened to be a scammer. The scammer started tricking the user into giving out personal information.
One characteristic is the close proximity between the two main characters. Since they work together as assistant and employer, they are often in each other's company a lot, which allows for a natural development of feelings. For example, in 'The Rosie Project', they spend a great deal of time on the 'project' which leads to a deeper connection.
In this fanfiction, Bella might face challenges from other employees who are jealous of her close relationship with Edward. She could have to prove herself not just as Edward's personal assistant but also as a capable professional. On the other hand, Edward might find himself falling for Bella because of her kindness and intelligence. He could start to give her special privileges, which causes some office gossip and more drama in the story.
I knew a personal assistant who had to deal with a client who was constantly changing their mind. The assistant was in charge of planning events for the client. Every time they had almost finalized the arrangements, the client would come up with new ideas or completely different themes. It was really frustrating as a lot of time and resources were wasted on the constantly changing plans.