"...look, I'm sure you mean well but you do realize this is theft, right? Also you're not my parents and I am in fact over eighteen so you have literally zero business doing this. Furthermore we have an organization that kidnapped your son to watch out for, and I need to fix my mother, even from a purely practical standpoint do you seriously think this is the best possible time you could have picked to test whether I can resist magical withdrawal? Supposing I cannot, this will duck us over."

...

Stiles grabs the notebook.

His father sighs.

"Stiles, think this through." 

"Deaton had it, right? But he wasn't paying attention when he was explaining things. You picked it up, and now you want it."

"Stiles, I'm worried that someone we barely know who tried to steal some of these objects from a heavily guarded home is over-estimating his ability to manage his addiction, and that it's going to get you and Alan killed."

"Is it using or touching, what's the verdict on that?"

"I'm not sure, the person who told my mother this was Victoria. As for my ability to manage my addiction—this needn't get anyone killed, just don't come with me. I'm not making you. And if securing Deaton's help is conditional on him acting like he has any rights over me then I do not want it."

"Kaede. Meet me at the place we ate, before we stormed the castle."

"So that's that, then?" he asks the Sheriff.

"Looks like it."

"Kaede, go. I'll be there in an hour."

He sighs. "Fine."

Off he goes, back to the Room to wait an hour.

And after an hour...

Stiles walks in and sits.

"...how'd that go?"

"They'll leave us alone. What's next?"

"I don't know. I should tap my contact—what are they going to do, they're not just going to let us run around with the key and these other objects—"

"If I can think of a way to help, they'll help. They won't try to stop us." 

"Really? Wasn't your dad super worried about me risking your life? He'll just stay hands off anyway?"

"My dad is worried about Deaton and you, and I convinced him that I can do the worrying about you for him."

"And Deaton won't decide to intervene for our own good?"

"Deaton didn't start this. My dad did. Trust me, I know how they work. Anyway. Let's plan our way out of this box."

"Okay. So first we need a proper list of all objects that are known to exist, but this will be way expensive."

"I can get police case files, are those worth anything? We could try using the Key to make money...how attached are you to the law?" 

"Not very but I also happen to be pretty rich. There's a pencil that produces a penny whenever it's tapped against a horizontal surface."