It seems that Viktor Krum is attracted to her when he arrives for the Triwizard Tournament in Harry Potter and the Goblet of Fire, but she does not reciprocate his feelings; she sees him as a pen-friend, though it is obvious to us that he wants more than that.
When Ron's relationship with Lavender ends, he suddenly discovers his true feelings for Hermione, feelings which Hermione has quietly had for him for the past three years or more; and by the end of the sixth book, they have become more than "sort of" together, according to Harry.
They remain so, with some friction, throughout the seventh book.
After Hallowe'en, however, she becomes friends with Harry and Ron, and later takes part in protecting the Philosopher's Stone, helping Harry to bypass the many obstacles leading to where it is being guarded.
In this book, we see a bit more of development of Ron and Hermione in a meaningful, non-romantic way. Hermione thinks Ron’s only good at Quidditch because Harry’s given him Felix Felicis. “Don’t say I’ll have to write the whole thing out again!
When Hermione is attacked by the Basilisk, Ron is incredibly torn up by it. Ron is upset because Hermione may or may not have kissed Krum two years prior… ” “It’s okay, we can fix it,” said Hermione, pulling the essay toward her and taking out her wand.
Let's take a look back through their relationship. ” And she stormed off toward the girls’ dormitories again. -Chapter 22 and tell Hermione she’s “fraternizing with the enemy.” The moment when Harry and Ron spot her in the book, descending the stairs in her gown is one of my favorite moments in the series.
Hermione and Ron’s friendship happens on shaky ground. They did a beautiful job with the translation in the film as well. There isn’t a lot of development relationship wise between Hermione and Ron in this book. “So don’t even ask.” “I thought maybe, you know, over Christmas—” “It was the Fat Lady who drank a vat of five-hundred-year-old wine, Harry, not me.” -Chapter 17 In the end, Ron’s poisoning and subsequent sick better muttering of Hermione’s name put them back on the track to reconciliation.