"Here's a chunk of the TARDIS. Grow your own." The Doctor said, throwing a piece of the TARDIS's Chronoplasmic Shell.
"But that'll take thousands of years!" The Meta-Crisis Doctor commented.
"Well—" The Doctor replied throwing his head back smiling, before being interrupted.
"If you shatterfry the plasmic shell and modify the to a foldback harmonic of 36.3, you accelerate growth by the power of 59!" Donna said without pausing for thought behind him.
"We never thought of that!" The two Doctor's exclaimed together, staring at her in simultaneous confusion and awe.
"I'm just brilliant!"
"The Doctor, in the TARDIS." The Doctor began as he looked back to Rose, his voice growing strained. "With Rose Tyler. Just as it should be."
"But he's not you!" Rose protested.
"He needs you. That's very me." The Doctors voice was low and gravely, like something was stopping his voice. Like there was a threat of something to come.
"But it's better than that, though." Donna was trying to break the tension, her voice was softer than usual and her brows were pulled together sympathetically. "Don't you see what he's trying to give you? Tell her. Go on."
The second Doctor looked over to the first.
"I look like him and I think like him. Same memories, same thoughts, same everything. Except I've only got one heart."
"Which means?" Rose asked.
"I'm part human. Specifically, the aging part. I'll grow old and never regenerate. I've only got one life, Rose Tyler. I could spend it with you, if you want." His face was hopeful, and his eyes were intense into her own.
"You'll grow old at the same time as me?" She stuttered softly, barely believing her luck.
"Together."
Rose shook her head in misbelief, and gently placed her hand on his chest, and felt his lone heart beating against her hand.
Everyone looked to the TARDIS as she gave a groan. The Doctor looked back to Rose, squinting slightly.
"We've got to go. This reality is sealing itself off for ever."
"But, it's still not right, because the Doctor's still you." Rose plead, hoping he'd change his mind.
"And I'm him."
"All right." She frantically looked between the two, hoping to find a flaw in the Doctors plan. "Both of you, answer me this. When I last stood on this beach, on the worst day of my life, what was the last thing you said to me? Go on, say it." She looked to the Doctor.
"I said, Rose Tyler."
"Yeah, and how was that sentence going to end?"
"Does it need saying?"
She gave him a look of sorrow, before turning to the second Doctor.
"And you, Doctor? What was the end of that sentence?" She asked, before he placed his hand lightly around the top of her arm, and leant in, his nose slightly brushing against her hair.
"I love you." He whispered, the words tickling against her ear as she heard the words she'd longed to hear all along. She stared back to him as he stepped away from his place, before grabbing the folds of his blazer and leaning her weight against him, locking lips. The possible and the impossible mixed once again – but this time she was in control. There was no Bad Wolf—nor was there a bitchy trampoline possessing her body. This was her, and the new Doctor.
Her Doctor.
The feeling of fire to fuel and electricity to copper ran through her lips, making her oblivious to the familiar creek of the TARDIS's door. What drew her away was the heavy wheezing and dense moans of the materialization of the TARDIS, a sign of the Doctors decent into her original world.
Possibly the last time that she'll see him again.
