Roommate
Koschei grumbled as he entered the room, a metaphorical storm cloud over his head.
Theta looked up from his homework and raised his eyebrow. "Why are you in such a pleasant mood?"
"This," Koschei mumbled, moving to his side. A small kitten crept cautiously into the room, its huge green eyes studying its surroundings.
"A KITTEN!" Theta shouted, running to it and picking it up. The kitten, obviously loving the attention, purred as Theta nuzzled it.
Koschei stared at Theta like he had two heads. "Theta… it's just a cat."
"But it's adorable!" Theta laughed, cuddling the ball of red and orange fur.
"And annoying," Koschei said. "It somehow wandered into the academy and followed me here."
Theta held the kitten up and looked between its legs. "It's a girl," he said. "What should we name it?"
"Theta, we're not…"
"Please?"
"Theta…"
Koschei stopped as Theta pulled up his most unbearable sad puppy stare.
"Please?" he begged again, sounding like he was about to cry (which he wasn't, but Koschei was so easy to sway).
Koschei sighed. "You can be a spoiled brat sometimes." He looked at the kitten, who was also giving him a guilt creating stare. "Fine."
Theta gave his giant white smile and cuddled the cat again.
Koschei plopped down on his bed. "So, what are we gonna name it?"
"Her," Theta corrected, "and you need to be more respectful. This is the first girl who actually wanted to be with you."
Theta had to look down at their new roommate as Koschei gave him a glare that could melt iron.
Credit for the idea came from my girlfriend, who just so happens to be the most important girl in my entire life, who happens to be a Whovian and cat fanatic. And yes, there are cats on Gallifrey. It's in the show.