@Misiakk A little while ago, when she was in his room looking at his bookshelf, he had lent out the book she wrote. Them figuring out that he's also the one who bought her self published work is the new tease that will probably take hundreds of chapters to resolve.
@123iamking she does recognize him as the clerk, but the person 'on her mind' is the writer of the book blog she likes that bought the copy of her novel.
of course that person is also him, but she doesn't know that yet.