AU from LotTL. Just like everyone else's AU, where the Master doesn't SPOILER and instead travels the universe as the Doctor's prisoner. Only this one is completely smut-less. When domestic bliss turns predictably to domestic insanity, our two renegades seek advice from one Captain Jack Harkness. Hilarity ensues.

Oh, and it's also educational.

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Half Baked
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It was good to see his friends again, Jack thought. Well, his friend and his mortal enemy. But the reason for their visit was, he had to admit, a bit bizarre even by Torchwood standards.

"I can't take it anymore." the Master groused. "I just can't!"

"Being his prisoner?"

"Yes, well, that too. But now he's banned me from the kitchen!"

"Well, there are knives in there," Jack explained in his most reasonable, calm-the-sociopath-down voice.

"It's not the knives," the Doctor interrupted. "The Master with a knife I can deal with. What am I saying -- the Master with tactical nukes I can deal with. It's the maniacal laughter."

"He laughs in the kitchen?"

"Yes. Drives me crazy."

"Not a long drive," the Master snapped.

"Shut up. So. As I was saying before I was so rudely interrupted, he drives me crazy. I was hoping I could leave him here with you for a while."

No no no no no "I'm not sure that's-"

"It'll be fine. Just fine! I'll be back for him before long, and if he gives you any trouble you can feed him to the Weevil. He might even regenerate into someone nice for a change. Just keep him out of the kitchen."

Back to that again. "The Master? In the kitchen? What exactly does he-"

"He cooks. Bakes, to be precise. He bakes bread. And he laughs."

"Seems pretty harmless to me. I mean, compared with what he did before..."

"Billions dead," the Master whispered, leaning in so his lips were within an inch of the Doctor's ear. "Billions!"

"See?" the Doctor whined, "He's doing it again!"

"Yes, yes," Jack turned his calming voice on the Doctor now. "But that's all in the past. Only not exactly the past, because it's paradoxed, but, well you know what I mean..." Jack wasn't sure he knew what he meant, and thinking about it just gave him a headache.

"No, no, no he still does it! Again and again! Billions dead, and he just laughs!"

"Maniacally," the Master added helpfully. "BWAhahahahaha!"

"Thank you," Jack said without much sincerity. He turned to the Doctor. "Now why don't you tell me what this is really about."

--

"Yeast breads?" Jack muttered in disbelief. "You came to ask my advice because of yeast breads?"

"Yes! He slaughters helpless yeasts by the billions! Cruelly bakes them to death for his amusement and laughs as he does it! I can't even eat yeast breads anymore and it's his fault!"

"Now just a minute! He's revoked my kitchen privileges, taking away my one and only creative outlet. He even confiscated my yeast and released it into the wild on a warm swampy planet. Wanted to 'make amends' by giving them a long and happy life. I swear in a billion years or so they'll be taking over the galaxy and then where will we be? I just want to bake bread," the Master pleaded. "Is that so wrong?"

"You'll get your turn," Jack shusshed him. "Now Doctor. You say you don't eat bread anymore? Because of cruelty to... yeast?

"Billions of living creatures, slaughtered. I won't have their blood on my hands. Not going through that again..."

"Yeasts don't have blood," the Master sneered.

"Their figurative blood, then. I won't have their figurative blood on my figurative hands. Happy now?"

"No. I won't be happy until I'm pounding out a nice soft loaf of bread dough. Bam! Bam! Bam!" The Master made punching and kneading gestures with his hands. "Until I can hear the screams of a billion tiny yeasts begging for mercy-"

The Doctor's eyes widened. "You can hear them?"

"Their figurative screams. Rassilon! You're pathetic. I liked you better as a dog."

"Yeah? Well I liked you better as a rotting corpse!"

"Why you-" the Master lunged at the Doctor and wrestled him to the floor. "Take it back! Take it back!"

"No!"

"Children, behave!" Jack forced them apart and turned to leave. "I think I can come up with a solution that will please both of you."

--

"Sourdough breads?"

"It's perfect," Jack announced. "Master, you'll get to mercilessly bake helpless yeasts to death every week. And Doctor, you'll get to rescue yeasts every week, save them from certain doom and lovingly nurture them along. Every week." He placed the tub of sourdough starter on the console. "What do you say?"

The Doctor already had the lid open and was grinning beatifically at its contents. "Awwww, who's a good little microorganism?" he cooed. "You? Yes you aaaaaare! And you! Oh yes. And yooooou...!"

The Master was harder to convince. "Do I still get to laugh maniacally while I kill them?"

The Doctor glared at him and hugged the little tub protectively.

"Don't push it," Jack said.

"Weeeeeeell, I don't know. If I don't get to laugh maniacally..."

"Billions dead at your hands, and you get to kill them over and over again, and you don't know?" Jack shook his head sadly. "Where's the Master that used to kill me over and over again just for fun? Tsk tsk. I think being his prisoner for so long has made you soft-"

The Master grabbed the tub of starter away from the Doctor, and the look on his face was murderous. "Soft? I'll show you who's soft!" He leered at the glop in the tub. "You're going to die, do you hear me? DIIIIIE! And then I'm going to EAT YOU! BWAhahahaha!"

Jack smiled and winked at the Doctor. His plan had worked perfectly.

-
Epilogue
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Jack had just stepped out of the TARDIS and was feeling smug -- like he used to feel after running a particularly successful con -- when he saw a frantic Toshiko running toward him. She hurriedly pressed a computer printout into his hands. His face fell as he scanned it quickly and then dashed back inside. "Don't leave yet!" he yelled. "Yeast Monsters are invading Cardiff!"

The Doctor paled. "What have I done?!"

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Postscript
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If anyone actually bakes anything as a result of reading this fic, please mention it in a comment. I'd love to hear how it went.