A/N: So this is just a quick little thing, meant to take place right after the Missy reveal, SPOILERS if you haven't seen the episode yet.
The Doctor stepped back from his nemesis, eyes wide in a combination of surprise and fright.
"You…" The Doctor spout, trying to catch his breath. Missy smiled. "How can you be here? How did you get off Gallifrey?"
"Wouldn't you like to know?" She said, clicking her teeth together. "But I've been out for quite some time, love. And I've been watching you." She moved her finger across the Doctor's chin. "What a chin you had with that last one. You could have poked someone's eye out. And I do sort of miss the bow-tie…"
"Stop it." The Doctor said, slapping her hand and collecting himself. "Why are you doing this?" Missy laughed.
"Why? Do you really have to ask that, Doctor?"
"To torture me? To make me watch the world I love burn?"
"To conquer of course. I only chose Earth because I do love to watch you squirm, my dear Doctor."
"Why? You saved my life. Sacrificed yourself."
"One, that wasn't for you, and two you didn't return the favor!" Missy snapped. "You abandoned me. Clever enough to save entire worlds, thwart any foe, make armies fall yet you couldn't save your best friend from the academy!" She composed herself. "Although it looks like you have a bad run with saving friends in the last millennium anyways." She circled him as the Doctor scowled, clenching his fist. "Do you really think the angels, buzzards of time travel, could think of a trap like that? Hmm?" The Doctor's eyes widened.
"And I heard you got married! That simply wouldn't do. I am, after all, the jealous type. Nothing a few books infested with Vashta Narada couldn't fix." The Doctor's eyes began to redden as he shook with fury.
"YOU!" He shouted, trying to summon the right words
"Yes." Missy grinned madly. "Me."
A/N: Not much to it, it just seemed as though the Master has been watching the Doctor for a while, so wouldn't it be interesting if she messed around in his life for a bit without him knowing?