1. He's already deeply involved in Misaki's life: Usui is a constant presence in Misaki's life, always watching over her and offering support. He already plays a significant role in her life without needing the label of "lover."
2. He enjoys the thrill of the chase: Usui finds amusement in teasing and observing Misaki, especially her reactions to his antics. Becoming a "lover" might take away some of that fun for him.
3. He wants Misaki to choose him freely: Usui wants Misaki to love him for who he is, not because of any pressure or obligation. He wants her to genuinely choose him, not simply settle for him as a boyfriend.
4. He's aware of his influence on Misaki: Usui understands that he holds a lot of power over Misaki, and he's cautious about potentially exploiting that. He wants their relationship to be equal and based on mutual respect.
5. He wants to protect Misaki: Usui is incredibly protective of Misaki, and he's hesitant to take on the responsibility of a boyfriend, especially when it comes to potential heartbreak or vulnerability.
6. He enjoys the ambiguity: By not explicitly defining their relationship, Usui maintains an element of mystery and excitement.
While Usui might find the idea of being a "lover" too troublesome, it's clear that he deeply cares for Misaki. His actions and words constantly showcase his affection and desire for her, even if he's reluctant to express it explicitly.
It's important to note that Usui's feelings towards Misaki evolve over time, and his reluctance to define their relationship fades as the series progresses.