Who's that, waving wildly outside the window? 

Stiles excuses himself. He can be a little late to class for whatever kept Scott from being obscenely punctual. 

"I can't find the Erase anywhere."

"Scotty, I need a little more than that, what are the rules here?"

"The Erase card, I don't know when I lost it, I haven't checked since we caught it."

"No, see, you lost me right there, the part where we caught a card yesterday."

"...Okay. You go to class, I'll try to figure this out."

Does he actually have Sadde's number?

He checks his phone. 

He goes to class, and makes all the appropriate excuses.

Hopefully Scott isn't just hovering outside. 

He does not in fact happen to have Sadde's number! But they did exchange numbers yesterday; it seems to have just disappeared from his phone. How odd.

Lucky that he does remember Sadde's number, then. 

Close enough, anyway. He gets it on the fourth try. 

"Today is yesterday," he says without preamble.

"Stiles hasn't noticed, so it must just be magical people. This is probably the Time card, none of the other names really jump out."

He fumbles with his bag.

"Kero?"

"It's definitely the Time."

"Does it have any weaknesses? How do we stop it? What can it do, besides repeat days?" 

"It can stop or slow time, too. I don't know how to stop it."

"Find it, get close without it noticing us...I should tell Alistair."

"I already texted him, but neither of us remembered your number."

"Okay, so we should probably meet up at the school. Since two of us are there anyway."

Who's this kid, talking to Sadde's teacher?

"I'm not so sure. I'll call you back."

He hangs up, and stops pretending he was asleep, and raises an eyebrow at Alistair.

"Here's the note. You can call them if you want, but this is kind of their thing. A little eccentric, I know."

He walks over to Sadde.

"I was just explaining to your teacher that my parents are eccentric rich folks who want me to audit classes at all the local schools before committing."

"Do your parents remember yesterday?"

He messages Scott: Alistair is here.

"Yeah. Yours?"

Okay, sure, we can meet at your school. After lunch?

"Mom's definitely a muggle."

Sounds good.