And the next morning:

"Goooooood moooorning Theeeeeoooo!"

"Ungh. Good morning, Cerberus," says Theo, a bit unintelligibly but quickly waking up.

"It's breakfast time! What's for breakfast? Can you bring me something?"

"Uhh... I was just gonna have cereal? What do you even eat? Besides, Dad's going to work today, so you won't have to hide up here all morning."

"Do you have something sweet?"

"Like what? A milkshake?" he asks.

"Yes! That's a great idea!"

"Okay. Wait here a minute; my dad should be gone in a sec," says Theo, and he goes downstairs to start on a milkshake.

Fortunately, his dad was just waiting for Theo to wake up before he left, and leaves.

Theo notices and waves him over. "Your milkshake's over there," he says, putting the ice cream way, then sits down and starts eating his cereal.

"Ooooh!" he says as he floats down towards it. He eyes the cup, taller than he is. "Is there a straw?"

"No?"

"...alright."

And he tips the cup over a bit so he can drink from it, and he's surprisingly strong for his size.

He's still shaped like a tiny stuffed bear, however, one without thumbs at that, so this goes predictably.

Theo sees the glass tip over, fall off the edge of the table, and start dropping.

Theo lunges for the glass, making his way out of his chair and across the table, grabbing the glass before it hits the ground.

Theo then slides across the floor a bit.

"Oops."

"Yeah," he says, picking himself up off the floor. Looking down at his clothes, they're a bit... covered in milkshake.

He puts the glass down, fetches a plastic cup, fills it with some milk, and finds a straw for it. After placing a towel down over the spill, he then disappears upstairs to have a shower and get a change of clothes.

Slurp!

Theo's back down shortly. He picks up the towel and mops the floor.

Cerberus has finished drinking!

He has also managed to open the refrigerator and is analysing its contents.

Theo watches him suspiciously, making sure he doesn't try to grab anything fragile.

Eventually he decides there's nothing there he wants, so he floats over to Theo. "So, how was meditating yesterday?"

"I think I saw the other card you were talking about," he responds.

Oh, and that reminds him. "There were also some connections from me to you and the cards...? What were they?"

"Ah, yes! As the cardcaptor, the cards subsist on your magic, and since I am their guardian, I do, too. That's why Windy was weaker than Fly, even though it should be stronger—it was relying on your magic, which is still weak."

"... They... subsist on my magic? You're just using my magic, and you didn't even ask me? Or think to tell me!?"

"No, that's not exactly it. You have a—magical capacity. Mine and yours are linked, so the stronger you are, the stronger I am, and the stronger are the other cards. And when you use a card, the more magical capacity you have, the more it can do."

"So it's not a reserve that you're draining, it's just a ceiling on what you can do? ... Does it grow with time, or what?"