The Doctor found being half-human quite troublesome.
For starters, with only one heart and a lack of a respiratory bypass, he couldn’t run as far or fast as before. Rose occasionally outsprinted him, tugging his hand and yelling for him to keep up, while he panted and wondered if he might pass out from oxygen starvation. In his exhaustion, if he happened to trip over his own feet and fall, and Rose hugged him and kissed his scraped palms to help him feel better, wellll … there was another train in a few hours anyway, so it was all right if they’d missed this one.
Another unfortunate side-effect: the necessity of sleep. As a Time Lord, he’d only needed a few hours a week, at most. Now he needed several hours per night. Rose seemed to enjoy curling up against him, so he really didn’t mind letting her rest in his arms. And if occasionally he happened to close his eyes, too, and leave them closed for longer than a few hours, and wake up next to her while she was all sleepy smiles, tousled hair, cat-like stretching and skimpy lingerie, wellll … not every alien invasion happened before sunrise, and sleeping in didn’t always mean the end of the world.
His half-human skin was also much warmer than that of a Time Lord. So much so, he’d been convinced he had a fever and woke up in a hot sweat every night for weeks. Rose finally suggested he sleep without jimjams on, to help stay cool and wellll … who was he to argue with sound logic, especially when it was Rose’s 400-thread-count Egyptian cotton sheets he’d be keeping clean?
Last but not least, there was the matter of hormones. Before the metacrisis, he’d had precise control over his endocrine system. But this half-human version was flat-out unruly. No matter how much the Doctor tried, he could not coax his thyroid to produce more triidothyronine, which meant his metabolism slowed to a crawl and he put on ten pounds in his first few weeks in Pete’s world. He had to stop sampling all the catered nibbles at Vitex fundraisers and wellll … Rose didn’t seem to mind a few extra pounds on him anyway, because every Saturday she made his favorite cupcakes, the ones sprinkled with edible ball bearings.
On the opposite end of the endocrine system problem, the slightest stimulus could trigger a willy-nilly release of hormones. Like the time Jackie brandished a pair of hair clippers and said something about a haircut, and the Doctor’s body flooded with noradrenaline. He went straight into fight-or-flight mode, dashing right out the back door of the mansion and into the woods. Rose tracked him down and told him that Jackie only meant to use the clippers on Tony, and wellll … Rose was beautiful when she was feeling protective, laughing and stroking his hair and promising she wouldn’t let her mother near his glorious locks even if she had to throw the clippers into the swimming pool.
Rose’s comforting embrace led to an entirely different kind of hormonal release. Endorphin and testosterone and he lost track after that, because his body was having another physical reaction his half-human self couldn’t control. And he certainly couldn’t hide it when she was sitting on his lap like that. And welllll … a bit of outdoor exertion was good for humans, the Doctor had been told. Rose quite thoroughly agreed.

On the northernmost continent of Omwiggom Prime, in the middle of a frozen and desolate landscape, the Doctor knelt with Rose on the ice. Dozens of fish, bright as living rainbows, swam just beneath the frozen surface of the water. Pulsing with light and color, they twisted and swirled in an elaborate dance, moving with the grace of eels.
“These are floe-fish, Rose. They live their lives in pairs. Mate for life. You can tell which ones are bonded by the pattern of colors they emit — synchronous refraction of light, specially adapted to this water’s high salinity and cold temperatures. Each member of the pair is always within the same spectrophotometric increment as the other. Each bonded floe-fish shifts to the exact same color as its mate, at the exact same instant, even if they’re half a planet away from each other. Remarkable creatures!”
Utterly entranced, Rose watched the floe-fish, and the Doctor watched Rose. One of the three suns of Omwiggom Prime set before he could tear her away from the radiant, dancing fish and lure her back inside the TARDIS. They spent the night bundled in blankets on the couch beside the fireplace, the Doctor fretting over Rose’s nonexistent frostbite and coming up with ever-more inventive ways to warm her up.
~*~*~*~*~*~*~*~*~*~*~*~*
Three weeks later, in Pete’s universe, Jackie dragged Rose out of bed and to a department store. Both women had been stranded with only the clothes on their backs, and although Jackie had already burned several holes in Pete’s credit cards building up her new wardrobe, Rose hadn’t bothered to get out of the mansion. Not once.
Jackie’s one-sided conversation didn’t stop as she pawed through the racks. “You know, Pete’s offered you a place at Torchwood. He says they could use someone with your experience. I think it’d be good for you, getting out more often. Well — at all. You haven’t gotten off the couch in weeks, and it’s not good for the size of your bum.” Jackie held up a blindingly pink top, made even more garish by the store’s fluorescent lights. ”What do you think of this one? It’ll look nice with your skin, sweetie.” Rose turned away without comment, listlessly shifting a few hangers on the rack in front of her.
She found the blue leather jacket crammed a the back of the row, half-falling off its hanger, sleeve dragging the ground. It wasn’t just any blue, either, but a particular shade. A bit brighter than the exterior shell of the TARDIS, but very unlike the vivid colors Rose had always worn. Something about this particular shade tugged at her.It resonated.
Holding this blue jacket, Rose had a sudden memory of floe-fish and spectrophotometric increments and life-mates whose colors shifted at the same time, even when separated by half a planet. And none of these thoughts made any sense at all, really, because Rose’s new-new Doctor always wore brown. Never blue.
It didn’t matter.
“I’ll take this one, mum,” she said, shedding her fuzzy aqua hoodie and pulling on the not-quite TARDIS blue leather. “This one’s exactly right.”

“You know what, they keep on trying to split us up, but they never, ever will.”
“Never say ‘never, ever’.”
“Nah, we’ll always be okay, you and me.”
Thing is, Doctor, no matter what’s happening—and I’m sure it’s bad, I get that.



In this new incarnation, the phrase, “I’m sorry,” came readily to the Doctor’s mind and lips, even when he wasn’t admitting fault. He often said it to express regret or sympathy, or to acknowledge suffering and cosmic injustice that even he couldn’t remedy.
But here on New Earth, watching Cassandra die and be mourned only by a younger version of herself, the Doctor didn’t feel the slightest bit sorry. The phrase didn’t come to his mind or his lips, not once as she cradled her own expiring body and called for help. No regret. No sympathy. Nothing.
For the second time, Cassandra had put Rose in danger. Even more monstrous, Cassandra had violated her. Took Rose’s body, invaded her mind, perused her thoughts – the damning evidence spoken from his own mouth by Cassandra: “You’ve been looking. You like it.”
The Doctor ached to hear of Rose’s feelings; he’d imagined her whispering them, hand clasped with his, body close and warm and deliciously human. But never, never did the Doctor imagine he’d hear them because her autonomy had been taken away and her mind desecrated.
Cassandra had violated the Doctor, as well. Horrifying enough, but something he could perhaps forgive. His race was, after all, telepathic. His mind could accommodate a mingling of consciousnesses; it was equipped for the strain. The human brain, on the other hand, was delicate. Unaccustomed to bearing the weight of two consciousnesses. Miraculously, Cassandra hadn’t obliterated every trace of Rose when she pillaged Rose’s body. Even more miraculously, she hadn’t damaged her intellect or personality or any other of a thousand facets that made Rose Rose.
The Doctor’s hands balled into fists. His hearts thundered, full of shadows and blood. His ears roared and his vision turned grey. His wrath was a shaft of crimson, beaming through the center of his soul, illuminating universes laid to waste and realities annihilated. He saw the turn of the cosmos cease; he saw himself make it happen. His fingers trembled with the need to pull a trigger, to flip a switch, to build engines of destruction and put them to use.
His Rose. Violated. Nearly lost, just as he’d nearly lost her on Satellite Five.
Never again. Not even if he had to tear apart the fabric of reality. Not even if protecting her reduced him to ash and bone.
“Doctor?”
His Rose. Her voice reeled him back from the precipice, away from unfathomable depths of fury and destruction. He schooled his breath to evenness and his pounding hearts to sedation. For Rose. Because what she needed right now was comfort, not vengeance.
The Doctor’s vision cleared. In front of him, Cassandra was dead. Without a glance back, he followed Rose into the TARDIS.

#I think during this moment when Davros is shoving the Doctor’s sins in his face and trying to make him feel unworthy #Rose isn’t looking at him with condemnation#She’s looking at him with sympathy #She knows him - she already knows the heart of him that Davros has challenged him to show her #And she is his equal in so many ways #She obliterated the Daleks and committed genocide just like he did #She has been manipulative and hard and cold as she’s traveled by dimension cannon and done what needed to be done#Because no one else could or would #Because she’s Rose Motherfucking Tyler #and he’s her Doctor #And while Davros is trying to evoke disgust#All Rose feels is sympathy and love (via gallifreyburning)