After the Order meeting that night Tonks lay on her bed and thought about what Dumbledore had said to Charlie and her. She knew that they'd been terrible to each other but she'd never thought that it had effected other people and she knew that she'd never want it to effect Draco. Now that Dumbledore had mentioned it though she was starting to wonder.
"Why do I always fight with him anyways?" She wondered to herself. "The whole quiditch thing was ages ago." She thought about it and then remembered how Hermione always used to tease her about liking Charlie. Of coarse she had always denied it, never mentioning that he had been her first crush at Hogwarts. He was the one who'd started the hostilities but she'd just blushed and pretend like she hadn't noticed and didn't care. Then she'd joined the Quiditch team, learned what a prat he was and had gotten tiered of him bugging her. She realized that was when she'd starting being hostile towards him.
Despite proclaiming to hate him, she'd always noticed that her heart would begin to speed up when his name was mentioned, she'd told her self it was from anger, or when he entered a room, she'd told herself it was from disgust.
Tonks began to feel a pit forming in her stomach as the pieces began to fall into place. She was in love with her archenemy Charlie Weasley, and had begun to be so at the age of 12. The next thought made the pit tighten even more. She'd been so horrid to him since that time that the likely hood of him ever liking her was zero, and to make it worse she was now obliged to see him on a regular basis since they were both Draco's guardians.
As she lay there contemplating her terrible fate the person she least wanted to see came into her room. "Tonks, I think we need to talk."
"Don't you knock, Charlie?" Tonks burst out, part from habit part from frustration, and the fight began.
"I'm sorry to disappoint you, but I did knock. I can't help it if you can't hear me through that thick skull of yours." Charlie replied, angered.
"You're such a prat Charlie Weasley! Maybe I was to busy thinking to be interrupted!"
"Yeah! Well, I felt I had something to say to the all-important Nymphadora Tonks that she might want to hear but I guess I was wrong. She thinks her thoughts are the only ones that are important!"
"Don't call me Nymphadora! And whatever this thing was you wanted to say was it must not have been that important if you decided to yell at me instead!"
"I was trying to be polite but you just put me down and didn't give me a chance to speak!"
"Well, what was I to expect besides being berated for something, since all you ever do is yell at me!"
"You know Tonks, I never want to yell at you!"
"What are you trying to do then if it's not yelling?"
"I'm trying to stop myself from doing this!" Charlie yelled before leaning down and capturing Tonks' lips with his own. To his surprise Tonks didn't pull away right away and slap him sense less. In fact, at first she didn't do anything.
Charlie decided this was even worse and began to pull away, trying not to think about what she'd do to him when she was able to react. He met resistance though and felt his head being pulled back down toward hers. That was when he realized that Tonks had wrapped her arms around his neck and was kissing him back with plenty of fervor.
Finally, after what seemed ages, she released him and pulled away. She smiled at him, "Now you should have just done that before and we could have saved all the breath we used on fighting."
Charlie, who's hair was now clashing terribly with his face, smirked, "Well, you didn't exactly encourage me. I've been fishing for you for ages and at first all I got was being ignored then I received your temper."
"Well, I guess we've got a lot of time to make up then." Tonks replied and pulled him toward her again.
"You look in excellent health to me, Potter, so you will excuse me if I don't let you off homework today. I assure you that if you die, you need not hand it in"
Professor McGonagall Prisoner of Azkaban
One last bit