He leaned on the TARDIS as he felt his feature change in a single painful burst. It was more sudden than before, perhaps because of the fact that moments before he went back to his default face, most of the work that he had done for this regeneration had happened just moments before at the clock tower, using the regeneration energy to destroy the Daleks. He was glad that that part of the regeneration had happened outside the TARDIS, she had complained to him the last time he regenerated about singeing her. In fact, when they were on the way to the junkyard, when she had inhabited Idriss' body, she told him that straight to his face.
Then went back to look at Clara cautiously. Clara stumbled back away from him, where moments before she had tried to touch his hand. He saw her face became sad in an instant. She was disappointed that it had happened. Her face was the first face that his new face had seen and he had made it sad. He looked into her wide eyes before he caught his new reflection in her brown eyes. Shocked, he cautiously made his way over to her, testing out his new height for a moment before crouching down to her to get a closer look.
Then there was a sharp pain in his side, he clutched it as tissue joined together to form something new, something that was there before. There was a name, he knew the name of them, and what were they.
"KIDNEYS!"
"I've got new kidneys" he heard a voice say, his voice. His new voice.
In an instant, he could see a glimpse of what they looked like within him. Oh no.
"I don't like the colour" he said rather disappointed.
"Of your kidneys?" Clara replied dumbfounded.
All of a sudden they both found themselves flung about as the TARDIS finally reacted to him.
"What's happening?" Clara asked rather panicked.
"We're probably crashing! Oh!" he found himself saying as he was flung forwards briefly in the direction of the doors before he managed to regain some composure.
"Into what?!" she said rather afraid.
"Stay calm." he told her trying to reassure her as he ran quickly to push some buttons, trying to remember something about flying the TARDIS, but nothing came to mind. He couldn't remember anything.
"Just one question." he said to Clara.
Clara slightly leaned forward slightly.
"Do you happen to know how to fly this thing?"
He looked over at Clara as she just recoiled back slightly fearfully.