My favorite scenes of them from Dark Reunion:

The snap of a twig exploded through her like gunfire.
She spun toward it, eyes and ears straining. But there was only darkness and silence.
Fingers touched the back of her neck.
Bonnie whirled again, almost falling, almost fainting. She was too frightened to scream. When she saw who it was, shock robbed all her senses and her muscles collapsed. She would have ended up in a heap on the ground if he hadn't caught her and held her straight.
"You look frightened," Damon said softly.
Bonnie shook her head. She didn't have any voice yet. She thought she still might faint. But she tried to pull away just the same.
He didn't tighten his grip, but he didn't let go. And struggling did about as much good as trying to break a brick wall with bare hands. She gave up and tried to calm her breathing.
"Are you frightened of me?" Damon said. He smiled reprovingly, as if they shared a secret. "You don't need to be."
How had Elena managed to deal with this? But Elena hadn't, of course, Bonnie realized.
Elena had succumbed to Damon in the end. Damon had won and had his way.
He released one of her arms to trace, very lightly, the curve of her upper lip. "I suppose I should go away," he said, "and not scare you anymore. Is that what you want?"
Like a rabbit with a snake, Bonnie thought. This is how the rabbit feels. Only I don't suppose he'll kill me. I might just die on my own, though. She felt as if her legs might melt away at any minute, as if she might collapse. There was a warmth and a trembling inside her.
Think of something… fast. Those unfathomable black eyes were filling the universe now. She thought she could see stars inside them. Think. Quickly.
Elena wouldn't like it, she thought, just as his lips touched hers. Yes, that was it. But the problem was, she didn't have the strength to say it. The warmth was growing, rushing out to all parts of her, from her fingertips to the soles of her feet. His lips were cool, like silk, but everything else was so warm. She didn't need to be afraid; she could just let go and float on this. Sweetness rushed through her…



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In that state of dreadful calm she looked up to see a flutter of wings blur and shimmer in the moonlight. Damon stood beside her, and she spoke quite collectedly and rationally.
"Will giving him blood help?"
He didn't seem to hear her. His eyes were all black, all pupil. That barely leashed violence, that sense of ferocious energy held back, was gone. He knelt and touched the dark head on the ground.
"Stefan?"
Bonnie shut her eyes.
Damon's scared, she thought. Damon's scared—Damon!—and oh, God, I don't know what to do. There's nothing to do—and it's all over and we're all lost and Damon is scared for Stefan. He isn't going to take care of things and he hasn't got a solution and somebody's got to fix this. And oh, God, please help me because I'm so frightened and Stefan's dying and Meredith and Matt are hurt and Klaus is going to come back.
She opened her eyes to look at Damon. He was white, his face looking terrifyingly young at that moment, with those dilated black eyes.
"Klaus is coming back," Bonnie said quietly. She wasn't afraid of him anymore. They weren't a centuries-old hunter and a seventeen-year-old human girl, sitting here at the edge of the world.
They were just two people, Damon and Bonnie, who had to do the best they could."I know," Damon said. He was holding Stefan's hand, looking completely unembarrassed about it, and it seemed quite logical and sensible. Bonnie could feel him sending Power into Stefan, could also feel that it wasn't enough.
"Would blood help him?"
"Not much. A little, maybe."
"Anything that helps at all we've got to try."
Stefan whispered, "No."
Bonnie was surprised. She'd thought he was unconscious. But his eyes were open now, open and alert and smoldering green. They were the only alive thing about him.
"Don't be stupid," Damon said, his voice hardening. He was gripping Stefan's hand until his knuckles whitened. "You're badly hurt."
"I won't break my promise." That immovable stubbornness was in Stefan's voice, in his pale face. And when Damon opened his mouth again, undoubtedly to say that Stefan would break it and like it or Damon would break his neck, Stefan added, "Especially when it won't do any good."
There was a silence while Bonnie fought with the raw truth of this. Where they were now, in this terrible place beyond all ordinary things, pretense or false reassurance seemed wrong.
Only the truth would do. And Stefan was telling the truth. He was still looking at his brother, who was looking back, all that fierce, furious attention focused on Stefan as it had been focused on Klaus earlier. As if somehow that would help.
"I'm not badly hurt, I'm dead," Stefan said brutally, his eyes locked on Damon's. Their last and greatest struggle of wills, Bonnie thought. "And you need to get Bonnie and the others out of here."
"We won't leave you," Bonnie intervened. That was the truth; she could say that. "You have to!" Stefan didn't glance aside, didn't look away from his brother. "Damon, you know I'm right. Klaus will be here any minute. Don't throw your life away. Don't throw their lives away."
"I don't give a damn about their lives," Damon hissed. The truth also, Bonnie thought, curiously unoffended. There was only one life Damon cared about here, and it wasn't his own.
"Yes, you do!" Stefan flared back. He was hanging on to Damon's hand with just as fierce a grip, as if this was a contest and he could force Damon to concede that way. "Elena had a last request; well, this is mine. You have Power, Damon. I want you to use it to help them."
"Stefan…" Bonnie whispered helplessly.
"Promise me," Stefan said to Damon, and then a spasm of pain twisted his face. For uncountable seconds Damon simply looked down at him. Then he said, "I promise," quick and sharp as the stroke of a dagger. He let go of Stefan's hand and stood, turning to Bonnie. "Come on."
"We can't leave him…"
"Yes, we can." There was nothing young about Damon's face now. Nothing vulnerable. "You and your human friends are leaving here, permanently. I am coming back."
Bonnie shook her head. She knew, dimly, that Damon wasn't betraying Stefan, that it was some case of Damon putting Stefan's ideals above Stefan's life, but it was all too abstruse and incomprehensible to her. She didn't understand it and she didn't want to. All she knew was that Stefan couldn't be left lying there.
"You're coming now," Damon said, reaching for her, the steely ring back in his voice. Bonnie prepared herself for a fight, and then something happened that made all their debating meaningless. There was a crack like a giant whip and a flash like daylight, and Bonnie was blinded. When she could see through the afterimage, her eyes flew to the flames that were licking up from a newly blackened hole at the base of a tree.
Klaus had returned. With lightning.
Bonnie's eye darted to him next, as the only other thing moving in the clearing. He was waving the bloody white ash stake he'd pulled out of his own back like a gory trophy.
Lightning rod, thought Bonnie illogically, and then there was another crash. It stabbed down from an empty sky, in huge blue-white forks that lit everything like the sun at noon. Bonnie watched as one tree and then another was hit, each one closer than the last. Flames licked up like hungry red goblins among the leaves.
Two trees on either side of Bonnie exploded, with cracks so loud that she felt rather than heard it, a piercing pain in her eardrums. Damon, whose eyes were more sensitive, threw up a hand to protect them.



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These Two scenes are my favorite scenes from Dark Reunion.I will add more and all the girls you can add your favorite quote regarding Damon/Bonnie.(image credit Bamon spot fanpop)