-R-
Rose sat in her room in the Tardis, brushing her hair at the vanity. Apparently, the Doctor never deleted her room after she left. It was a large room, with a bed larger than a King size. There were windows, but instead of windows looking outside, they looked into the artificial garden with artificial realistic sunlight, and real plants, and a real pond. The entire garden was about 3 acres large.
Back to her room. She didn't have much in it, no bookcases were needed, since there was a Library with a swimming pool. She didn't need a closet, even though she had one, because the wardrobe was right across the hall. She didn't need a Television, there was a movie theatre three doors down from the Library. She only had a bed, a closet, and a vanity. She didn't need nor did she want a computer, internet or anything. It would just remind her of the world she had just left behind.
-D-
The Doctor sat on his bed, in his room, thinking. He had a modestly small room; he never spent much time in there. He hardly needed sleep, Time Lords having two hearts and all. The walls were purple and white striped, and the carpet was white as well. He had bookcases full of trinkets and such, trunks full of odd memories.
He thought about Rose. He thought about why he had left her that second time–because she was mortal. She could never live forever, even though he wanted her to. "If there was a way…" he thought to himself. "If there was a way, I would take it." But he knew there was no possible way. He knew that Rose would always be human, and he would always be Time Lord. He could use the chameleon arch…"NO!" he told himself, "Rose would hate that."
He took off his jacket, unhitched his bracers, took off his bowtie and shoes, and lay on his bed. Staring at the ceiling, he used his sonic screwdriver to turn on the skylight, so that he could see images of the stars and planets.
Soon, he saw an image of Gallifrey. It made him miss home, miss his family, his friends, everything. "Rose has never been to Gallifrey. She'd love it there. The second sun, lighting the red mountains ablaze, the red grass blowing in the breeze, the flowers that bloomed every morning along the crimson ocean. The Citadel City, oh, she'd love it there." He remembered that in Citadel City, there was a council that could grant extra regenerations. A Time Lord has unlimited regenerations, but it was against the law to regenerate more than twelve times.
But the Doctor felt conflicted. He had to let go of her, because she would age, and wither and die, but he would always stay young and never die. But he never wanted to leave her again. He doesn't want to see her slip away. He was selfish. He wanted her for himself. He wanted to be with her forever.
A knock on the door interrupted his thoughts. "Come in" he said, solemnly. Rose came in, and sat next to him. He sat up, and sat next to her.
"Is something wrong?" She moved a hair from his face.
"I'm selfish." He admitted. Rose put her arm around him, in a comforting hug.
"No you're not. You are the most un-selfish man I've ever met."
"But I am. It's selfish of me to have come back to you, to bring you with me. You would have had a better life, not knowing who I was or anything of that sort." He picked up her hand, caressing its smooth surface.
"But maybe I want this too." She looked him in the eye, which she noticed had tears running down the sides.
"It's not right. I'm stealing you. I'm stealing the perfect life you had before you met me."
"Maybe I want to be stolen. Doctor, don't worry about it. We've done that sort of thing before."
"You weren't living with me for forever, though. Your mum was home."
"And she is now! With dad and Tony! Doctor, why do you keep worrying about this? I love you, and you love me. Isn't that enough?" Rose held his big, rectangular face in his hands, caressing his face with her thumbs.
He wanted it to be enough. He gently held her wrist, and kissed her. She pulled back. "You haven't answered my question."
"I want it to be enough. But you, you're mortal. And I'm immortal. When you die, I don't know what I'll do with myself." His eyes began to water. Something about this regeneration was so…emotional.
-R-
Rose didn't exactly reply to that. She didn't want to tell him that in her dreams, before she re-met the Doctor, she would always have images of the Bad Wolf. The Bad Wolf, that sucked in the Time Vortex, the Bad Wolf that could scatter it's name across all of creation; every second, every universe, Bad Wolf was everywhere. She didn't tell him that she could still feel the Bad Wolf inside her, making her powerful.
"We'll find a way." She kissed him. They sat there, kissing, until she stopped. "Can we visit Satellite 5?"
"Excuse me?" The Doctor stared at her, astounded.
"Yeah, Satellite 5. After we left. I want to see what happened afterwards." She said. But what she really wanted to do was re-visit the site where she was Bad Wolf, just so she could connect with that energy somehow, to see if the Bad Wolf could make her immortal. It was crazy, and a bit selfish, but she wanted to try.
"Rose, after the Dalek invasion they destroyed Satellite 5," he informed, "Why would you want to go there anyways?"
Should she tell him the truth? "No," she decided. "Well, maybe. I mean, I trust him with my life. My life a billion times over, to inifinity."
"Doctor…" she started. But she was interrupted when the Tardis made a hasty warning siren, causing the Doctor to jump up and race down the stairs to the console room. "Never mind." She muttered, once he was out the door.