Not Him
It was clearly obvious to anyone who even looked at the last two Time Lords in existence that they were in love with one another.
To them, however, it was absolutely impossible because she was the Doctor and he was the Master and it was just absolutely impossible!
But in their heads they were thinking, their minds running a mile a minute; their thoughts were going so fast that the doubts and questions about their relationship was over in a second before the humans could even comprehend what was happening.
And then one day they had a realization. For the Doctor, it wasn't a massive display with admissions of passionate emotions and I've loved you since the day we met but rather a quiet moment and a sudden thought.
They were being held by Davros with no chance of escape. Her TARDIS was dead, Don was dead and the monster that was Davros was about to kill the Master out of revenge for something he had apparently done during the Time War that Davros had taken offense to.
And the Doctor tried to stop herself from screaming and yelling and making a complete fool of herself because she would later have to explain herself later (if they lived). And she watched as he stood there with that smirk that existed purely to irritate the Doctor; he was expecting this and the Doctor watched as he stood unflinching, staring into the mad and haunted eyes of Davros.
But suddenly she was the one staring into his brown eyes and suddenly she realized that under the layers of the Master, Koschei was still there. And under the layers of the Doctor, Theta was still there.
And suddenly it wasn't as impossible because she was Theta and he was Koschei and it could be right.
"Oh, how sweet," The moment was interrupted by that horrific voice of Davros and the Doctor clenched her fists by her sides and her body stood taller because whilst he can threaten the universe, send as many Daleks across time and space with the intent to kill everything and anything and move twenty seven planets into the Medusa Cascade... He can't threaten her friends.
And especially not him.
