Note: All quotes taken from pages in the American versions of the books. No quotes have been altered to fit the Harry/Hermione shipper perspective. Seeing [...] only means that I've omitted parts of text that have nothing to really do with the main point of the quote, or that the quote goes on for too long for our purposes.
The Philosopher's Stone | The Sorcerer's Stone
Already, Hermione is worried about Harry enough to risk getting in trouble. She knows him so well already that she's waiting up for him. But how did she know they were sneaking out?
Harry has never known anyone to be so brash and the book even states, "Harry had never known anyone to be so interfering." It takes him aback whenever Hermione stands up to him. It's so cute to see him have these internal struggles about Hermione so early on. Harry is normally so passive around people, because of how he was raised. He was so used to "yes mam, yes sir," that even when he first got to Hogwarts he was a bit of a "go-along" with Ron. Hermione is the first person he learned to have nerve with. So in a way, she helped him gain more confidence in standing up to people.
Harry is startled to see Hermione in tears. As we read the next paragraph, we sort of get to see his guilt about laughing along with Ron about her.
Harry is the first one to think of Hermione when the troll is let loose.
Harry is beginning to realize what it's like to really have friends. And we as the reader are beginning to see how often Hermione puts herself in harm's way to save Harry, whether it's physically or emotionally. She could have been in serious trouble yet she took the blame anyway. And Harry is the one who defends her to Ron later on.
Hermione races to save Harry and even assaults a Professor in order to help him.
Hermione isn't scared for her own safety when she thinks Harry is in danger. She runs right to him, leaving Hagrid puffing along behind her.
That Hermione would risk expulsion to help Harry show loyalty and solidarity. Very sweet.
"Harry - you're a great wizard, you know."
"I'm not as good as you," said Harry, very embarrassed, as she let go of him." [...] "You drink first," said Harry.
This is too cute. Not only is Hermione very nervous and proud of him at the same time, but she's trying to reassure him and build up his confidence while being an all around great friend. Harry, like any boy at that age, is nervous and embarrassed of a girl being so touchy-feely. But his concern for her shows through this entire scene, making sure she drinks the potion first and is safe before he continues.