The Doctor was right; the Master did have words to say about it when he returned to the Tardis with the small girl in hand. Words and a look that obviously said he was a little confused and bothered by the Doctor's new little stray; part of the Doctor wondered why he had to make the Master's body so intricate and detailed. The child looked up at the android with a slight frown, unsure what to make of him before turning to the Doctor, looking for answers. He was unsure whether to answer; would it really make sense to her if he told her it was a robot of someone who was both his best friend and worst enemy, who he saved from death and gave this body? He somehow doubted it and patted her on the head instead before looking at the Master, "Is something the matter?"
"You have a small human," observed the Master.
"Yes I do."
"A small, dirty human."
"Just a little."
"Is there a reason for this or have you decided you plan on home growing your own loyal female companions?" asked the android with a somewhat bemused tone.
The Doctor pretended to contemplate that, "Might be a bit better in the long run instead of picking them up fully grown."
The Master sighed, "Sarcasm Doctor?"
"Sarcasm Master?" the Time Lord retorted.
Beside him the girl started to giggle, obviously finding this exchange amusing; smiling some down at her he then moved to go further. "Come along then, let's go give you a bath and get you some clean clothes."
From behind he heard, "You're not keeping another stray, Doctor!"
The Master was of course ignored and the Doctor and his new friend made their way further into the Tardis; the girl looked around them the whole time as they walked, obviously intrigued by the surroundings. The Doctor noticed and smiled a bit, thinking it amusing to watch the curiosity; considering the blank apathy on her face before it was sort of nice to see light in the child's eyes. Then again wasn't that why he brought her back? He wasn't all that sure really, about what drove him to bring her with him, why he was keeping her there. It made little sense in a way yet seemed just like him in the same way; it was the usual duality of the Doctor.
They arrived at their destination, one of what he suspected were many bathrooms aboard the ship; he led her inside and thought for a moment before leaning down to her level, "I'll just start up the tub for you so you can wash up on your own okay?"
She looked at him and frowned, shaking her head; he raised an eyebrow but she grabbed his sleeve, pulling on it, "You want me to stay?"
She nodded and he patted her head, "It might be a bit odd..."
She gave him a look that challenged him on that and the Doctor chuckled, deciding he would definitely enjoy having her around; he sighed in false defeat, "Alright then, I'll help you out." It wasn't like he was going to do anything to her and she was just a child, still quite young, so she'd need help with cleaning her hair at least.
She smiled at him and he went to turn on the water for the bath while the six year old got out of her dirty clothes, setting down her parcel and pulling her slightly too large shirt off her head and wiggling out of it. Once the bath was filled in warm water, not too hot but not cold either, he stepped away to grab something from the cabinets, a rubber duckie for some reason or another. Then again he was the Doctor; of course he had things like rubber duckies around. He turned to find her already in the tub, seeming to be enjoying the warmth after being out in the cold air for so long; he chuckled and gave her the duck, "Here you can play with this if you want."
She took it looking at it then let it float, watching it bob around for a while before smiled and starting to play with the floating bath toy. He took that as a opportunity to get her hair clean if the stuff in it; he removed his jacket first, rolling up his shirt sleeves so they didn't get soaked. Grabbing the shampoo he poured some into his hands then rubbed them together before lathering it into her hair; she made a face but didn't fight it, allowing him to wash her hair. The dirt and blood came out slightly easy, not all that difficult but her hair hadn't been brushed in a while; he frowned some and got up, looking through the cabinets again. It was mostly luck that he found a brush and he returned to her, "I'm sorry, this will probably hurt."
The girl didn't respond but hugged the duck, closing her eyes; the Doctor proceeded to brush her hair, hearing whimpers as he tried to get out the knots. They were pretty settled in and he felt bad for her; still he worked and tried to ease her through it as much as possible. He was reminded of watching Susan suffer like this when she forgot to brush her hair for too long and he smiled lightly at remembering his granddaughter.
It took some time but he managed to get the knots out eventually, running his fingers through the long black strands; he then returned to washing his hair, putting in more shampoo and gently washing it out, trying to keep soapy water out of her eyes. She complied easily and after getting that done the Doctor got up, wiping his hands off on a towel, "Okay there you can handle the rest."
She nodded silently and he set the towel where she couldn't get it, "I'll be right outside; once you're done and dry, knock on the door and I'll come get you and we'll go get you some clothes from the wardrobe, okay? I'm sure we can find you something in your size."
The Doctor left the bathroom and closed the door waiting outside. Inside the girl splashed around some more and cleaned up, getting the dirt and dead skin cells off; it was nice to feel clean and she soaked for a time before getting out. The child made sure to drain the tub before climbing out, grabbing the towel and wrapping it around her body, drying off. She pouted slightly at her own rubbing of her wet hair, trying to make sure it was as dry as possible; she couldn't unwrap the towel from her body after all. She grabbed her wrapped "staff", holding it close in her arms for a moment.
Afterwards she knocked and the Doctor opened the door to look down at her; she stared up at him, wrapping in the towel that was almost bigger than her with that thing in her arms again, looking quite a bit better now. He smiled, "Ah good let us get you some clean clothes. Follow me."
She nodded and trotted after him as he led the way to the Tardis wardrobe where all clothes in the Tardis came from, full of costumes and clothes of all sorts of planets and eras, all for the use of the Doctor and his companions. This regeneration and the Master found little use for it, they liked their own clothes well enough, but it was good to keep extra clothes around anyway.
The large room, rather a huge closet, was always a mess, with clothes on racks and in chests packing the space; the girl looked around then at him and he gestured, "Well take a look, see if you can find anything you might like."
She took his suggestion, going out and looking cautiously for clothes in her size; in the meanwhile the Doctor examined nearby chests for anything, instead finding some of his old clothes. A cricket jacket, a cravat, a rainbow colored coat, a large scarf; there was even a recorder and a familiar old hat he remembered from his first body. He tried it on again, looking in the floor length mirror; not bad but not really his thing. He was about to remove it when he felt someone pulling on his pant leg; the Doctor looked down to see the girl had returned, fully dressed. A simple little blue sun dress, two mismatched socks and sneakers, her parcel tied to her back so it lay in a diagonal that was easy to have to carry; she looked up at him and smiled, holding out her arms as if to say "Ta-da!". He smiled then took off the hat and set it on her head, "Ah now you look like a doll."
She pouted at him and he chuckled. A voice cut through from the door and the Doctor saw the Master there, observing them, "Well don't you two look cozy."
"I really should have programmed you to shark," mused the Doctor.
"Ah but then what fun would be that?" he retorted then glanced at the girl, "What is your new friend's name anyway, may I ask?"
It struck the Doctor then that he didn't know; he hadn't asked, knowing she didn't speak and the bartender hadn't mentioned any name. He was about to say so, unfortunately have to admit to not knowing when something happened; a third voice, soft, sounding hoarse slightly from disuse, sounded behind him and both the Tine Lord and his android looked at the girl as she spoke, "Tsukiko, you can call me Tsukiko."