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"No, no. Please, stay still Kyra. I just want to scan you." the Doctor said. Kyra giggled as she grabbed at the sonic screwdriver he was passing over her and tried to pull it into her mouth. The Doctor got closer. "Kyra please" he pleaded. He was now just close enough for her to grab a handful of his hair and yank. "Ow! That really hurt. Boy you have a strong grip. I see you take after your mother. Fine then, I'll use the Tardis scanner" At this moment Bill walked into the room, and her mouth gaped at the scene.

Doctor, where did that baby come from? she asked in confusion.

"Ah, her. It's complicated. I'll explain later." the Doctor said trying to brush it off, unsure how to explain the strange scene.

Bill's eyes widened in surprise. "Did you steal a baby? " she asked incredulously.

"What? No! No, of course not. Why would you think that?" the Doctor replied in innocent perplexment.

"I don't know you very well. You might be a baby knapper for all I know.", Bill said matter-of-factly and shrugging. Nothing threw her off balance for long. "Where did she come from then?" she asked.

"She's my daughter."

"With who?"

"Someone you haven't met yet, so any names would be meaningless to you, but suffice it to say my wife, obviously." the Doctor said somewhat grumpily.

"You're married? Where is she then?"

The Doctor flinched at this, making him act all the grumpier. "I don't know. She might be dead, for all I know. But I'm sure going to find out. She can't go leaving our children on the front stoop like this."

Bill was a hitchhiker he had picked up in a frenzy just after River left. His wife knew how hard it would be for him, and had pleaded for him to make sure he wasn't alone when the time came. Up until now Bill had been hiding somewhere in the Tardis, unsure of this strange man who had offered her a lift out of a sticky situation. From the looks of it she had been right in doing so; it looked like a tornado had blown through the room.

"She's cute. What's her name? " she said walking towards the two.

"Kyra."

"Are you going to get a baby knapsack to carry her in?"

"A what?"

"A knapsack on your back. You'd strap it on and carry her in it."

He looked down at the squirmy baby, and realized just how hard it would be to jump over pools of lava or climb cliffs with her wriggling for freedom in his arms, pulling his hair, and spitting up on his favorite coat, all while they were being pursued by some sort of monster. "Actually, that may may not be a bad idea. Do you have any idea where I might find one of these?"

"At a baby shop, I suppose."

"Nevermind, I think I have an idea. " He left for a moment and then emerged with a makeshift baby carrier made from a travel bag with two large holes cut in the bottom

"Are you sure that's safe?"

The Doctor looked down at Kyra, and realized that it wasn't safe enough. "No, you're right. She's so fragile. I'll go look in the storeroom" he ran off harried that he had ever thought to stuff his poor daughter in that.

He soon came back with an actual baby carrier, which Amy and Rory had left behind. "Here Kyra, this was to be for your mother, but we all know she would have hated it anyway."

Kyra looked at him puzzled, and then stuck her tongue out a bit and gurgled happily.

"Good. I'm glad you like it." the Doctor replied.

How are you going to get her in? Bill asked.

What do you mean? I'll just lift her in. The Doctor said with a unworried air.

You haven't been around many babies, have you? Bill said knowingly.

"Not for a while, no. Here, I'll strap it on, and you lift her in. " the Doctor said putting it on his back and turning around expectantly.

"Ok, here goes" Bill said carefully picking up the wriggling infant and trying to lower her kicking feet in. Still, Kyra was surprisingly amiable about the whole thing, and she looked around curiously at the new view for a moment, before grabbing her father's ears from behind. She could reach them now. The Doctor patiently tolerated this. A silly manic grin appeared on his face and he began to happily try gently trotting around with her on his back. Kyra giggled and grabbed at his hair as he made low horse noises.

Bill joined in giggling and bounding around the room with her curly hair bouncing around her. They finally settled down laughing in the Tardis console chairs. As he strained to catch his breath, he thought of how long it had been since he'd had this much fun.

"That's enough for now" Bill said still laughing as she lifted Kyra out of her carrier and handed her to the Doctor.