What Really Happened in FMA: Why the military dorms won't allow pets
(This takes place before the war against Ishbal)
Roy Mustang had just joined the military; he didn't have a lot of money, so he and Grand were roommates. Back then, the two of them were the best of friends, this is the tragic tale of how the two became bitter rivals…
Mustang was dragging his cases down the hallway.
"Do you, need some help?" asked Armstrong.
"Thank you," he said as Armstrong picked up one of his bags.
"No problem, my name's Alex. Louis Armstrong and if you ever need any help, just ask."
"And you can call me Roy Mustang, the flame alchemist."
"Ahh so you're an alchemist as well, I'm the strong-arm alchemist. So tell me Roy, who's your roommate?"
"The iron-blood alchemist."
"Ahh so you're bunking with Grand sounds like fun."
"Well this is my room, thanks a lot."
"Don't mention it, say what is that?" he said while pointing to a glass tank.
"Oh this is for my pet."
"Ah a pet, a man's best companion at times. Wait a minute, where is it?"
Roy smirked and then removed his shirt, and wrapped around his upper body was a long, thin, snake. "The temperature outside was too cold for him, so I put him in my shirt to keep him warm."
Armstrong held back a laugh, "Keep an eye on him, we wouldn't want him to get loose, see you in the mess hall for supper." Armstrong left and as he walked down the hall he thought to himself, Wait until Grand gets a good look at Mustang's " little friend"…
Roy entered the room, it was fairly tidy for a guy's dorm, then he noticed a small cage on Grand's desk. In front of the cage there was a sign that read "Mr. Piper".
He went closer to the cage and tapped the bars; a little black mouse popped up and squeaked.
"I see that you've met Mr. Piper." Grand said as he entered the room, "you must be Roy." He held out his hand for Roy to shake it, when he noticed the snake, "What is that thing?"
"Slithers, don't worry I won't let him near your mouse, in fact I'll leave him in his tank so he can't bother anyone."
Well this all worked well and fine until one stormy night, when Slithers broke loose… the nest morning, Grand noticed that Mr. Piper when missing too. Since then Grand has hated Mustang with a passion. This is also the main reason why they no longer allow pets in the dorms.