The Doctor has been saved
Clara knew she had to do this, for an old friend, even if it meant entering a monster infested Library. She would do this only for him.
She had been with the Doctor, on a foreign planet exploring, when she saw a familiar figure. Bowtie, tweed and all limbs. The eleventh face of the Doctor was here, and she'd never been happier.
"Stay right here. I, uh, forgot my coat in the TARDIS." Clara quickly sputtered out before she lost sight of her first Doctor. Even though she loved this incarnation and he acted like a father to her, She deeply missed the fezzes, Jammie Dodgers and his terrible coordination.
"I guess it is terribly cold.." The Doctor scratched his gray hair as a breeze blew past. "Be careful though Clara!" She barely heard him. She was already sprinting toward the face she knew all too well.
"Doctor!" She screamed when she knew she was out of the other Doctor's earshot. She was already out of breath but she didn't care. She had to say a proper goodbye, one she never got the chance to say. He snapped his head around looking for the source of the scream, and she saw his eyes light up when they made eye contact.
"Oh Clara!" He shouted, wrapping her up in a hug. He set her down and moved his mouth while making various adjustments to her hair and dress. She felt the idiotic smile creep across her face and she didn't care. He was back. Maybe not forever, not even for 2 hours, but he was back.
"What are you doing here?" Clara exclaimed, happy to see her Doctor again. Although, this Doctor looked considerably aged and had some gray hairs speckled throughout his dark brown locks.
"Well I just thought I'd drop by and check up on you, but you-" He stopped, looking down at Clara's hand, which was placed on his bowtie. Something, or someone, inside her told her to straighten his bowtie. She has no idea why she did it, but she remembered only one person ever straightened the Doctor's bowtie. His wife, River Song. The woman he loved, the woman he married. She quickly took her hand away and hid it behind her back. Clara muttered "sorry" and put her other hand on his arm. The Doctor looked like he may burst into tears at any moment and Clara just gave him a slight smile. He quickly recomposed himself.
"Listen Clara, I have a special mission for you." He fumbled around in his pockets and finally found what he was looking for. He handed Clara a strange implement, which on further inspection, turned out to be a Sonic Screwdriver. It looked just like his, even had the green light enclosed in the claw-like top. Clara flicked her wrist and the claw opened, shining the light. She closed it back.
"Why do I need your sonic?" She asked curiously, slipping it in the pocket of her skirt.
He sighed, scratching his cheek. "This is a duplicate of my sonic. An exact copy, except it has something extra. It has a copy of me. An exact copy, with all my memories."
Clara must have looked confused. Why was she given an exact copy of the Doctor's eleventh self? She opened her mouth to speak, but the Doctor continued, shifting his weight on his feet.
"Listen Clara." He grabbed her shoulders and got closer to her. "I know I'm going to regenerate soon. I am nearing the end of this face. But I made a promise to my younger self and to some one who means the world to me. My wife. She is in that library database, stored for eternity. She's waiting for me, and I cannot let her down. I need you to go to the Library and upload that copy of my consciousness into CAL. Just plug in the sonic and CAL will do the rest. Once that is uploaded, Me and River will be linear forever. We can raise a family, and do all the other normal married stuff we never got the chance to do. Please Clara, don't do this for me, do it for River. Please."
The Doctor's eyes pleaded with Clara's and she knew she couldn't refuse. She would beg, plead, and lie for the other Doctor to take her. She had to do this for her Doctor. She grabbed the outline of the sonic in her pocket.
"I'll do it. But what about the Vashta Nerada? And you can't land the TARDIS on the Library planet anymore." At that instant, The Doctor reached in his other pocket and pulled out a vortex manipulator and a purple and blue swirled pendant that had Galifreyan inscribed on it.
"That vortex manipulator is River's. She would want you to have it I'm sure. The pendant will keep the Vashta Nerada from detecting your presence. It makes you almost invisible-like. At least to them." He kissed the vortex manipulator and patted it, like he was saying goodbye to another piece of River. "Now once I regenerate, which is in your past now I suppose, That whole regeneration will join River in the database. I've set it up so the copy is like my clone, but once i change, part of me will transfer during the regeneration cycle. So it's like a chunk of me, being-" He stopped, realising he was not only confusing Clara, but himself.
"Nevermind the schematics, just please Clara. I've got to return to Christmas now. Goodbye Clara" He hit a button on his vortex manipulator and vanished in a flash of light. She stood there, dumbfounded for a second and then snapped back into reality.
"Clara! Are you alright?" The Doctor questioned running over to where she was.
"Yes I'm fine, I just have a favor to follow through on. I'll be back soon, I promise. Just got to finish something for an old friend." Clara strapped the vortex manipulator on her wrist, seeing the coordinates for the library already punched in. She draped the pendant on over her red shirt and saw the Doctor's eyes change. He knew where she was going,exactly where. He also knew how important her mission was. He just semi-smiled and lowered his head.
"Right. I'll, uh, see you soon Clara." He smiled and nodded as she pressed the button and disappeared, off to join him with his wife for eternity.