Start with a strong opening scene that sets the mood. Maybe it's a scene in the Vampire Academy cafeteria where a strange lemon - scented event occurs. Then, introduce your main characters and gradually build the plot around the 'lemons' concept. You can also draw inspiration from other fanfictions or vampire - related stories to add more depth to your writing.
Begin by creating a unique character that will be central to your fanfiction. This character could be a hybrid or have a special power related to lemons. Next, establish a conflict or a goal for this character within the Vampire Academy universe. It could be something like trying to find a cure for a lemon - related curse that is affecting the vampires.