"And you, Doctor?" She said, turning to the man clad in blue, "How's that sentence gonna end?"
The Doctor leaned close to her, and whispered almost inaudibly, "I love you."
Rose stared at the Doctor in the blue suit for a moment. He looked so much like THE Doctor, her Doctor. Suddenly, she pulled on his lapels and pressed her lips to his. To her surprise he responded immediately, his lips moved against hers as he wrapped his arms around her, pulling her closer to him. For that one moment, everything was gone from Rose's mind.
Only when the TARDIS started dematerializing did she come back to her senses. She pulled away from the... man she had been kissing and ran towards where the TARDIS was, but it was gone before she could get more than a few steps away from the man who was supposedly the Doctor.
Tears started down Rose's cheeks, silently she went to wipe them away, but the Doctor grabbed her hand firmly.
"I really am him, you know." He told her, without shifting his gaze from the indentation in the sand where the TARDIS had been mere moments ago.
"I'm not sure I believe that." She said, her gaze still locked on the spot where her Doctor had left her, again.
The Doctor beside her dropped her hand. He was now staring at her intently, "Please, my beautiful, clever, wonderful Rose. Please, give me a chance to prove it to you."
Rose tore her gaze away from the indentation in the sand, and inspected the man's face. She was trying to find something different about his face. Some little tell tale sign that meant he was not her Doctor, but he was a perfect duplicate.
"One chance." She whispered.
He beamed at her, but all she could muster was a weak little smile.
"Come on." The Doctor told her, and he held his left hand out.
She just stared down at it unsure, but when he wiggled his fingers it reminded her of right after his regeneration when he had told her where they were going next. She grabbed his hand, and followed her mother's footprints away from the ocean towards the shore.
With the hand that wasn't clasped in Rose's her quickly checked his pockets. He felt the small lump of the thing in his right pant pocket. He sighed, relieved from the assurance the little object brought.