Now this was reassuring. Contents of Jamie's and Victoria's brain and memory did not change, they simply switched roles. Really, if there were the actual "grown-ups in children's bodies", that would've been creepy... But no. Now the emotional aspect took over the rational. In all, it was clear that Jamie and Victoria knew who the Doctor was and completely trusted him, but their choice of decisions was turned upside down.
"Let's try simple ways", the Doctor said aloud, feeling slightly uneasy - those huge brown eyes wouldn't tear off him. "It all began with massage oil, so..."
In some minutes the simplest way to get rid of possible reason (and not only it) was organized. Now the Doctor was sitting on the side of the bath tub filled with water and a thick layer of white foam as well - this was just in case. Victoria was the first to be placed inside, while Jamie was put in a playpen behind the door - this was the only way to keep him away for a while.
"I haven't done this in a while..." the Doctor murmured and squinted - Victoria widely beamed at the sight of bubbles surrounding her and, as every normal child, began splashing and playing around. However, this did not last long, and bathing the girl took not too much time and trouble, apart from the matter that the result was not the expected one. Must've been gotten too deep to wash it off, the Doctor thought, having finished, and wrapped Victoria, who didn't mind at all, in a huge fluffy towel, then placed her into the playpen.
"All right, Jamie, your turn..."
Now this appeared to be not too easy. Jamie didn't want to be washed: when the Doctor scooped him up, he began squirming, attempting to get free, and two or three times he almost reached his aim, having nearly fallen onto the floor. When this part was over and the little one was placed into the refilled bath tub, his energy found a new way out: he began throwing "snowballs" (or rather "foamballs") at his guardian. But this was over as soon as he spotted that now the Doctor was not amused.
"I appreciate your wishes, Jamie, but would you sit still for a moment? The oil may have different effects with different-gendered people..."
But it didn't. Jamie was a child and remained the same all the while. And the Doctor's serious tone (which soon was gone: how can anyone be serious with a small being like this?) had a little effect: soon enough Jamie went on playing with bubbles.
"Close your eyes, Jamie, or the soap will bite you", the Doctor warned after having thoroughly rubbed the little one with a sponge. "What did I tell you?"
Jamie's high-pitched scream was the best answer, so the Doctor had to pour warm clean water over him, calming him down, for quite a long time. But when the bathing was over, Jamie made it clear that he didn't want to get out.
"Enough for today! Look down, you've splashed a whole puddle out!"
At last they were asleep in normal conditions, the Doctor thought. Jamie and Victoria were huddled under the blankets, keeping close to each other - even when they had been laid to sleep, they had refused to stay apart. Even more, when the Doctor had been about to leave, they had called out for him - in their own way, but clear enough to be understood.
"I'm to learn Baby language some day", the Doctor muttered. "Fine, now the rational thing to do will be..."
Not stopping murmuring to himself, he left, trying not to think about possible consequences of their (highly improbable, but possible) growing up during the sleep.