By using the Master's Tardis, the Doctor was able to try and decipher the Master's plan. Why did he do it? Why didn't he constantly seek to destroy? How many times had she reached out to him? How many of her lifetimes had she spent trying to save him from the dark path he had chosen? Laughter from behind her was a reminder that she had at least someone by her side who understood. Perhaps with (Y/n) she could finally get through to him. Hope stirred within her at the thought of being able to steer him onto the right path, but the doubt still lingered and it was slowly eating away at that dream.

(Y/n) was conversing excitedly with the important women from time. The Doctor was thankful for the distraction as she didn't know how much longer she could put off telling her what she had done to their soulmate. In fairness he deserved it, he had done far worse to her in the past, but perhaps it would have been better to turn the other cheek.

(Y/n) knew the Doctor was hiding something from her and it had something to do with him. She didn't push it when the Doctor brushed away her questions about him, but there was a feeling of unrest without him near. She excused herself from the conversation and walked over to the console.

"I know what he's doing." The Doctor said as she sensed (Y/n) next to her. "Why? Why does he have to keep doing things like this?"

"Has - has he always been this way?"

"Not always. There was a time." The Doctor's eyes seemed far away and darkened with a sadness that had begun to bleed through the hope she always tried to show to the universe. "It doesn't matter anymore." There was so much (Y/n) didn't know about her, either of them. (Y/n) shivered as if the warmth from her body had been stripped away. It was then she realised that she could no longer feel her mark pulsing, either of them.

A wave a nausea suddenly washed over her. The Doctor managed to catch her before she hit the floor. "I'm okay. I'm okay." (Y/n) didn't know if she was trying to reassure the Doctor or herself. The timelord placed a cool hand on her forehead.

"You're burning up." (Y/n) leaned heavily against her as she was led over to sofa and forced to lie down. The Doctor turned away from her, but was too late to hide the guilty expression on her face.

"Doctor? What's wrong with me?" She tried to reach for the timelord's pale hand, but it was just out of reach.

"I don't know." She said as she brought her hands to her temples and massaged them to try and ease the tension that had been building there. Liar. Her mind whispered. A pang resounded with her. It was if a switch had been flicked as this was not the Doctor who had greeted her just under hour ago. The more she thought about, the more she wanted to know why her demeanour had suddenly changed, but was too cautious to ask. She had already angered one timelord, she didn't think she could stand another. Instead, she lay there as the Doctor went about disremembering the Master's plan. She frowned as her mark didn't even tickle at the thought of him. The lack of feeling from the ink on her arms brought her a numbness that seemed to have paralysed her body.

Ada Lovelace came and knelt down beside her. "Even though I do not understood what is happening, I do happen to have quite a lot of experience with fainting spells."

"Thank you, Ada, it's an honour to be in your company."

"I believe I am the one who should be honoured. The things I have seen - I cannot fathom, but they are truly extraordinary. It seems your Doctor is the only physician to make a difference to my life."

My Doctor? Some of the warmth she had lost returned to her at the thought.

—

"So, what do we do now?"

"I stop him."

(Y/n) breath caught in her throat when the Doctor corrected her. It was clear that she didn't need or perhaps want her help. She wasn't much use in the condition she was in anyway. She had taken a step back and let the Doctor do what needed to be done in order to stop the Master's plan. Her body felt wary by the distance the Doctor had suddenly given her and it didn't help the fact that the Doctor still hadn't told her about what happened to the Master. After the Doctor had told her what he had Barton and the Kasavin had planned to do, she felt sick, even more so then she already feeling. Why did he hate humanity so much? Was she included in his pursuit of chaos and destruction?

The Tardis had landed with a jolt. (Y/n) headed for the door, but was blocked. The Doctor came close to her, but still put a noticeable distance between them.

"I want you to stay here."

"What? Why?"

"I need to know that you will be safe." Liar. Her mind whispered again as the feelings of confusion and hurt began to overwhelm her.

"Bullshit!" Anger burst from (Y/n) out of nowhere. "You just want me out of the way. Isn't that right, Doctor?" The timelord stumbled back by the ferocity of how her soulmate had spat her name. (Y/n) gasped as her mark came back to life with a vengeance. The negative emotions that weighed her down had now lifted along with the ability to think. She gazed upon the Doctor wide eyed. The Doctor stared back, clearly in pain and struggling to stay upright.

"I-I-"

"We have no time for this! Lets go!" The Doctor ground out and left leaving behind two very confused women and one guilty (Y/n). I've done it again.

She wiped away the tears that had fallen and rushed out after her.