Damon : But it has to be right Elena , Its true that I can't stay away from you because I love you and I can't bare to not see you every day or even fight with you , the thing that matters is that I'll keep you safe weather you wanted it or not nothing more ..while he was crying and trying to hide it. Elena was torn inside by now she couldn't let him be her friend and nothing more , she felt guilty for not letting him be with her instead of Stefan .. but just then she was welling to do anything to make Damon happy so she asked him : what can I do ? just tell me what you want me to do right this moment and I'll do it even if I'm cheating on Stefan than I'm glad its with you , with whom my heart wants .
Damon was gazing at her and he couldn't believe that she would hurt his brother for him ,than a thought hit him (a kiss) is all what he needed from her, from her warm soft lips. he told her :
"Kiss me, Elena. Just once." His voice held a note of hope and his tone bordered on

Elena had flashbacks of the last time they had 'kissed.' His mouth had been rough and demanding and had tasted like whiskey, as he held her face tightly between her hands "Once," he repeated, cutting her off. He had taken two steps toward her and their bodies were almost touching. "Please.
she wanted to kiss him.
she had to know why the very thought of kissing Damon was pushing her nearly over the edge " Okay, Damon," Elena murmured, reaching a hand up to his face, gently pulling it down. "I will kiss you. Once. Elena reached around the back of his head with her other hand and urged him closer, until their lips were mere inches apart. She heard him draw in a shaky breath. In the time that she had known Damon, she had never seen him like this – this fragile, this vulnerable – not even when he had discovered that Katherine wasn't in the tomb. His lips were unexpectedly warm and soft The kiss was so simple and pure that Elena never wanted to break it. So, hand still tangled in his hair, she pressed him down further and tenderly drew his bottom lip between her teeth, sucking softly. All that mattered in the world was this moment; Elena's lips moving over his, so carefully and tentatively – as if she was afraid that she might break him And just as she was pulling back, Elena felt something hot and wet splash her cheek. Looking up, she realized with a shock, that tears were spilling out of Damon's eyes, rolling slowly down his cheeks and dripping onto her own face. Damon let the tears spill down his cheeks, not bothering to hide them. There was something utterly redeeming about the moment, and he didn't think he could stop it if he wanted to. Elena wrapped her arms around his silent, trembling form Damon's body thrummed with desire as Elena searched his eyes, running her hands through his hair. God, he needed her. He loved her. But even in the heat of this moment, he couldn't tell her that. She could never know that
Elena suddenly knew; she had always known.
She loved Damon