"What about mine?" 

"That one's a girl too - I have a boy and Aadhya does too."

"Gotcha." 

She turns her attention back to the mouse. "You need a name," she coos to it, "but I should probably wait a bit to name you, because all the ideas I have right now are unbearably sappy." 

Aadhya has let her mouse run up the inside of her sleeve out her neckline onto her shoulder. "...all I can think of is Pinky. I suppose it's not like he's going to care if it's silly."

"Because that's what you call baby mice?"

"Cartoon character, but plausibly that's where they got it. I like it better than Mickey, at any rate."

"Hmm. I don't feel particularly tempted by Jerry. Or Minnie all by itself, but, like, backing that up, Minerva isn't terrible...except that Athena slash Minerva have this whole owl thing going on, which feels a little morbid for a mouse." 

"Precious precious precious," El whispers to her mouse.

"Xiao Xing," says Liu, looking a little like she's had this name in mind for years and simply hasn't previously dared to apply it to any specific mouse.

Awwww. 

She pets her mouse, and thinks. 

Something sentimental without being the kind of thing that would be embarrassing if she gave it as a nickname to a person... "Penumbra. Hey, little one, do you wanna be Pen?" 

To the others: "...It's the name I gave my first real dagger, when I was a little kid." 

"As opposed to the Nerf line of weaponry?" El asks, watching Precious rub her little face with her little paws.

"As opposed to, like, blunted training daggers. I did actually have some Nerf weaponry, though, that and laser tag were sufficiently weapons-training-y to interest me and sufficiently Normal Childhood Activity to appease my dad."

"I bet you were a terror at laser tag."

"We played in teams that were me versus everyone else and I was still a terror." 

"Adorable." This probably means Lucia but might mean Precious, who she is petting.

Either one is valid!!! 

"Hi Penumbra. Little Penny," she coos to her own mouse, stroking it some more. "Oh, you're so soft and warm, aren't you." 

"With such little paws!"

"That is true, you do have itty bitty paws!" 

Theoretically it would be fine to put Penny in one of the larger of her gazillion pockets but she lets her perch on her shoulder instead when they finally make their way to the vending machine. 

With enough tokens, the hit-or-miss nature of the vending machine can still add up to a decent spread, and Aadhya knows a guy who'll buy the duds for what it's worth to haul them to his room because his transmutation affinity means it's less relatively extravagant for him to turn them into edibles. They can take their treats up the stairs to Lucia's room and share with their mice.

It's wonderful. Lucia eats vending machine treats and feeds bits to Penny and occasionally picks up her Sanskrit flashcards. When the others pick up mana-building exercises, Lucia starts doing trickybalance exercises. 

"I can build mana the normal way, too," she says when they look at her. 

"Okay, but why would you?"

"Mana is mana. If I get a little bit by squishing some grubs or by doing balance exercises, it all spends the same. And if I do my balance exercises, I get better balance!" 

"I guess that's true."

"You guys are building mana, even though I'll share." 

"Well, I still have to get these crystals all back in shape even if you're helping."

"Also our names aren't actually up on the wall yet."