The Doctor looked at his family again as Rory carried Tristan and led Hope up the stairs to their bedroom. His first family had been lost with Gallifrey; he kept swearing to himself that he wouldn't ruin this family as well. So he took them on trips to places that were safe, and let them live their lives as normally as they possibly could.
He began playing with the controls of the TARDIS, distracting himself from his thoughts about his life on Gallifrey. He was half-listening to River and Amy talking and half paying attention to the various switches he was flipping. It didn't take long for the girls to be standing by him wondering where he was going to take them.
"To the beach, it's been awhile since we had a good day at the beach. The children will love it and it will be relaxing."
Amy grinned. "All this relaxing must be hard on you."
He shrugged but River replied for him. "He hates it, but ever since we learned that I was pregnant he refuses to do anything fun."
"Well I'm glad," Amy admonished. "I don't want my daughter to keep being in danger, especially not when you're pregnant." She paused a moment, the idea of already being a grandmother obviously not something she was able to handle yet. "So a beach, where and when?"
The Doctor hummed and twirled around the console a bit. When they stopped moving he checked the console's coordinates. "Earth, Hawaii, 2537."
"Hawaii, good choice," River said with a smile.
He shrugged. "I didn't choose it, the TARDIS did." He didn't miss the uneasy glance between the mother and daughter. "Don't worry; I'll make sure you're safe." He kissed River gently and hugged Amy. "I won't let anything happen to you again."
"I'll hold you to that," Amy said, and he could have sworn it was a challenge coming from her.
He left the Ponds and went outside, expecting beach but instead found himself inside of a warehouse. He soniced the area and didn't find anything suspicious but he continued to carefully search the area. It didn't take long before he found a locked door. His better judgment never winning out, he soniced the door, only to find that it wouldn't open. He kept trying which led to him shaking his head and his screwdriver a lot.
"Well that's odd, what sort of lock doesn't open for a sonic," he wondered aloud.
"A time lock," was the unexpected answer.
He turned slowly to the source of the voice and saw two people, both of whom were shockingly familiar. The older one was a man he had traveled with before, so long ago now, Jack Harkness. The younger one, the one who had spoken, was a woman. She was impossible.
"Marek," he whispered, so stunned he felt a sudden need to find the wall for support.
She shook her head. "No, not Mareksa."
He realized the truth of her words. She was very similar to Mareksa, but the face wasn't quite right, and the voice was different all together. The similarity was striking though, and he still wanted an answer. "Who are you then; Jack what is this place?"
"My name is Sophia or Sereialian, and I'm your great-great granddaughter."
The Doctor looked at her for awhile contemplating the possibilities and Jack was just standing behind her grinning, though not as brightly as the Doctor remembered. "But that's impossible I can tell when there is a Timelord nearby and I don't register that from you."
"I'm Susan, Arkytior's, granddaughter. I'm a quarter human, I wouldn't register as a Timelord to someone whose sensitivities only included purebloods."
"That's not possible."
Jack finally stepped forward a bit and the Doctor could see that his friend had aged a little since they had last met. "Doctor, I didn't believe her at first either but she has two hearts and far more brains than your usual human."
"Scan me with your TARDIS if you don't believe me," she challenged.
He wasn't quite sure what to think. The woman standing in front of him was a total stranger with his first wife's face. If she was telling the truth the resemblance would make sense as the physical genetic traits a Timelord possessed when conceiving a child did pass on. He also was aware that he couldn't perceive part Timelords or he would have known the truth about River from the day he met her. He looked between the two and decided that it was worth the risk to take them into the TARDIS. He wanted to know if she was truly his descendant, what they were doing in that warehouse, and why the TARDIS had come to that place.
"Fine, but I want to know everything."
She nodded. "Of course."