It would take a while for her to notice you and get a good impression of you since she's usually in her world with books and stuff lol. But once she does notice you, her mind will be occupied with thoughts of you, only you constantly

You might be noticed by her if you get good grades like her in your subjects or if you're a rule breaker and a bad boy/girl in which case she'll have to discipline you and get rid of that bratty attitude of yours

She'll learn literally EVERYTHING about you, don't underestimate her stalking and information gathering skills, especially when it comes to you. From finding out your favorite foods, to your friends, to your personal life to even when you sleep, she'll find out everything about you. And she'll be so discreet about it, you won't even know that someone's gathering so much information about you, that's her specialty. Oh, and of course, she also has Harry and Ron helping her out on this and it's not like they had a say in this matter anyways

She's found out about you so much she knows you better than yourself and she's willing to place bets on that. She's also started to fall in love with you and she doesn't know why it doesn't agree with her whenever she sees you with someone else. She just doesn't know why she gets so irritated and feels that burning rage inside her whenever she sees you interacting with someone else. True, now she was your friend and you liked her as a friend type of way, but now, Hermione's type of love for you was spinning out of control

She has a dark look whenever she sees you talking to someone else for too long and she'll deliberately come over to you and try reminding of you about some homework or test or she'll tell you that you asked her for help in a subject and she needs to tutor you now and stuff like that. She'll start saying random stuff just to get you out of there, and if you're being targeted by the Slytherins, especially that cow Parkinson, she won't take it lightly

She'll tolerate it if someone talks badly about her but she won't stand for it if someone talks bad about you and your personality, you're kind, smart and the light of her life, she'll grit her teeth and tell them off. And if they still keep talking nonsense and garbage about you, her blood pressure will be in jeopardy lol since she'll get mad and take her wand out and hex them or something. And the interesting thing is, she'll do it in such a place and time that she won't get caught and get in trouble, she's sneaky and smart that way

No one would ever expect the goody two shoes book loving Hermione Granger to develop such a deep and twisted obsession that she calls love for you. And no one would really believe you anyways when you tell them that Hermione has been creeping you out lately, like come on, she's Hermione Granger people. And another thing you should know, she's highly competitive and she will not stand for anyone else trying to pursue your love. She won't literally threaten them or kill them off the bat, I can't see her doing that

She'll first tell them to back off sweetly and kindly saying that she's interested in you and she'll give them three warnings and if they ignore her, she'll have to hex them. Hexing them is as far as she'll go. Oh, and she might even Obliviate their memories, making them forget about their feelings for you, or who you even are for that matter. She told them to leave you alone so many times, yet they didn't listen, it's their fault, they had it coming

Will she kidnap you? Depends. If she thinks you're in danger and you get hurt way too often she will have to take you for your own good and safety. She'll try her best not to drag you on any of their crazy adventures and by they, I mean, Harry, Ron and herself since she's way too concerned for your safety, your safety is her top most priority, she can't stand the thought of seeing you hurt

She also feels very proud like a mom whenever her kid gets a good grade in a test whenever you get a good grade or good marks in tests, she'll no doubt steal those papers of yours. If you like writing stuff she'll steal those as well and she'll love every word you've written. But if you write too many violent things she'll have to have a word with you to tone it down a notch since she doesn't want her precious angel getting too many violent thoughts

She thinks really highly of you and she expects you to tell her that you love her for taking care of you so well after she kidnaps you. She won't stand for any misbehavior from you at all, she's stern and strict when it comes to discipline and she will make you admit you're the one at fault. And if you try escaping from her, she'll just find a way to get you back, she isn't just a normal witch after all, she's probably read so many advanced spell books and using one spell or the other, she'll locate where you're hiding and take you back with her eventually. You can only stay away from her for so long....