Well, it's definitely a great way to uh...Keep the teacher's desire in check, but the guy seemed like the decent sort that just wants to do his job normally and it's the students that come onto him...
"If you resist, you're fired"? As if he needed more reason to welcome her...training.
Great ending though, I have to say. I get the distinct feeling that she's just a Tsundere that's jealous of the...attention he gets from his students, and I love it.
He gets a boner everytime she is angry on him (or even speaks with him) and she gets angry with him cause he has a boner (and she gets jelous of his students) - that is an infinity circle which leads (eventually) to happiness and lots of sex for both...
Would be really great if this would get a second chapter in which she would bang him and in midway would say something like "you are mine and can only look at me!"