Here, in brief, is what I gleaned from Hull's article:
Teachers and students are notoriously known for becoming sexually involved. But this isn't the Eros of Teaching. The Eros does have a physical element of desire, but it is more about the passion, excitement and joy of finding someone with whom one can share a common desire for knowledge. If someone becomes passionate about politics or literature, it is most likely because the person had a person or group who inspired this passion---the eros.
The most effective way of inspiring Eros in a student is for the teacher to admit their own lack of knowledge (ie. Socrates and his "I know nothing"). The teacher's acknowledgment of his own lack helps the student recognize their own lack. Love is the pursuit of what one lacks. The Eros is the pursuit of this love. The teacher cannot fill the lack, but can go in pursuit of the love together with the student, filling his own lack in the process.
This article was haunting. It explained most of my academic life, revealing to me all the instances of Eros with professors, and those instances in which I have been the object of Eros to others. It makes Hahn's loss all the more difficult. Even though I hadn't seen him in years, I knew he was out there and available. I am in pursuit, but he was potentially available to be present.
Now I feel alone and dislike the idea that I might be the teacher to others. It's a repugnant responsibility.