The contrast is appealing. It goes against the traditional gender roles. In normal stories, guys are often seen as the dominant ones. So, when an anime girl is in the dominant role, it's fresh and interesting.
One example could be in the anime 'Fruits Basket'. Tohru Honda, a kind-hearted girl, often has moments where she unknowingly dominates the guys around her with her pure heart and strong will. For instance, she manages to get Kyo Sohma to open up more and face his inner demons, which he wouldn't have done easily without her influence.
One common theme is the breaking of gender norms. In these stories, the anime girl defies the traditional expectation that the guy should be in control. For example, in 'Fullmetal Alchemist', Winry Rockbell is a skilled mechanic. She doesn't let the male alchemists around her overshadow her skills and knowledge, and she often stands her ground when it comes to decisions related to her work, which is a form of domination in a sense.
Once upon a time, there was a girl named Lily. She was dominant in her school's debate club. Whenever there was a debate, she would take charge. She led her team to victory many times with her strong arguments and confident demeanor. She wasn't afraid to speak her mind and always had the upper hand in discussions.
Well, in some stories, a dominant guy may have a very firm will. He doesn't easily change his mind once he has made a decision. For example, in a business - themed story, he might be the one who overcomes all the opposition and makes his business thrive by sticking to his own strategies. Also, he can be very protective. In a romantic story, he will protect the female lead from all kinds of threats, whether it's from other people or difficult situations.
Another theme can be self - discovery. Through the process of drawing the girl, the guy might learn more about himself, his feelings, and his artistic style. It could be a journey of understanding his own identity as an artist and as a person in relation to the girl he is drawing.
In 'Kill la Kill', Ryuko Matoi is a very strong - willed anime girl. She dominates in battles against many male opponents. Her search for the truth about her father's death drives her actions and she doesn't let anyone, especially the male - dominated power structures in the story, stop her from achieving her goals.
Another anime is 'The Garden of Words'. Here, the male protagonist Takao Akizuki, who is an aspiring shoemaker, often sketches in the garden where he meets Yukari Yukino. His sketches are influenced by her presence and their interactions, and it has a very poignant and artistic feel.
For this fanfiction, first, describe the setting of the auction. It could be a grand, yet seedy affair with all kinds of strange characters. The slave girl, with her big, sad eyes and timid demeanor, catches the guy's attention. He outbids everyone else. Once he has her, he takes her to his home. At first, she is scared, but gradually, she starts to show her true personality. She might be feisty and strong - willed. This surprises the guy, and he begins to respect her. Eventually, they could team up against the corrupt system that allows the auction of slaves in the first place.
One possible plot is that the guy in the van is actually under the control of a more powerful villain. The anime girl, who might be a key figure in the anime's lore, is kidnapped to be used as a bargaining chip. However, during her captivity, she befriends a small creature or another captive in the van. Together, they come up with a plan to escape and expose the real villain behind the kidnapping.