Disclaimer: This story is about Rose's reason for choosing Bad Wolf as a message through time and space to herself. The characters in this story belong to the BBC and I do not take any profit from this story.
The reason for Bad Wolf.
The hand that grabbed hers back at Henriks was calloused, working class, manly and strong. The eyes were blue, piercing and wolf-like, he looked predatory and animalistic but she felt safe. He had after all saved her from the shop dummies and told her to run. Was he a terrorist? Anarchist? Definitely something that was dangerous she thought to herself, especially with those eyes.
The next day, Rose slumped on the sofa and listened to her mum drone on to her friend on the phone. The cat-flap rattled and Rose got up to investigate, when she pushed it out, there was someone looking back at her, those piercing, blue eyes, like the grey wolf that Rose had seen at the zoo on a school trip a few years back. He had a lean, long, hungry face, with sharp cheekbones and big ears, but his eyes conveyed so much warmth. He looked like a geezer, a right bloke, someone her mum would pick up at the pub but for some reason Rose trusted him, because his eyes were lonely and kind.
She followed him through time and space, revelling in the joy of running with him, the danger they found themselves in and watching him move stealthily beside her all the way. When Jack Harkness joined them, they felt like a family, the Doctor was the alpha male of this pack, despite Jack's flirting skills. For Rose the Doctor was always her mate. His lupine eyes always followed her and she was just as fiercely dedicated only to him. In their quiet moments, silence revealed so much more than words, they would hold hands, caressing each other by soft touches, a gentle stroke on his arm and a brief lingering look at her lips when she laughed with joy of living in the moment.
With Rose, he was loving and considerate but he could turn savage and cruel if anyone threatened his Rose, his face would darken and his eyes and teeth would flash with predatory intent leaving no-one in doubt that he was wild and untamed, a force of nature. His lean muscles would flex and his voice would change to a growling timbre, his stance intimidating, seeming larger than he actually was, just like a wolf.
Scattering the words through time and space, Bad Wolf, Rose finally acknowledge that she had the she-wolf in her and that is why she loved the Doctor.