Sensei is actually quite pure, huh? She's a real kuudere.
I feel her hesitation, though. I feel like she wants this relationship with a guy that's into her, that treasures her and only her, but she's acutely aware that he's a student and that's legally and morally wrong. I see a sensei that went through high school and medical school without a solid, meaningful date. She gave her all to her studies, and sacrificed her love life to be a nurse. This little boy is giving her the attention she craves, but it's wrong. As long as he keeps paying attention to her, she'll continue down the slippery slope of a forbidden love.
This author is doing quite well in conveying emotions.