We immediately set off to create the Marauders' Map. They got me, the more brilliant of the three, well, four of us, to look through the spellbooks while they traced the Hogwarts map onto the parchment.
"Find anything yet, Moony?" James asked, raising his head to look up at me from the floor.
"Still searching... After all, you found me about ten spellbooks here! I have to read them all to find that spell. Could be other spells to go with it." I replied bluntly, looking back down at the second of the ten books I had to look through.
"Well, do tell us when you find 'em, yeah?"
I looked down at him over the top of the book with a slight annoyance.
"Of course he will, James! It's Remus we're talking about here! He knows what he's doing." Sirius spoke up, not looking up from the map.
...
Yes, James can be an idiot some days, but he can be clever when he wants to be. Just upset about over who pounced him earlier.
"Right, well then... Best leave you to it, Remus!" James muttered as we resumed at the Marauders' Map, nearly done tracing Hogwarts onto it.
"Sirius! Remus! We forgot about the GROUNDS! We forgot to get a map of Hogwarts' GROUNDS!" James blurted aloud, causing Remus and I to jump slightly.
"Shh! You're going to get us heard!" Remus whispered angrily, sending a look of aggitation towards James, "We'll get that later, but for now, we need the spell! Unless there are multiple spells, in that case... We need the spells before we get the map of Hogwarts' Grounds! Unless you two want to get that while I sit here and find what we need in here-" he gestured at the multiple spellbooks, "I suggest you keep it down!"
Remus never snapped like that before! I looked over at James and nodded. We both rose up and grabbed our bags. When Remus looked at us, we explained we were off to grab the map of Hogwarts' Grounds and drop off the map of Hogwarts we had.
...
I didn't mean to snap, but it felt like I couldn't hold it back! Watching them leave the dormitory made me feel a little better though, now I could search in peace.
Now, back to the task at hand. I currently held a notebook, with a self-inking quill. What should I even be looking for?
Homenum Revelio? Might work, except it would only work if there was someone in the area of use. I scribbled it down anyways.
Protean Charm? Sounds promising... Causes copies of an object to be remotely affected by changes made to the original. Sounds useful... I wrote it down in the notebook.
Specialis Revelio? What's this do? Causes an object to show its hidden secrets or magical properties. I scribbled that one in as well.
I seemed to have found everything useful as James and Sirius came back in with the other map.
...
"Find all you needed, Remus?" James tip-toed in as if Remus was a lion he didn't want to anger. Remus nodded.
"Well, I found three spells that could possibly help us. Trace out the Hogwarts' Grounds first though, same parchment, then I can cast... If that's alright?" Remus smiled half-heartedly.
"Yeah, it'd be best you do the spells, anyway..." I began, walking up to our spot on the floor and sitting down.
"Alright then, that's settled... I'm sorry.. about earlier. I didn't mean to snap, y'know... I've just-"
"We understand, Remus." James smiled.
"You do? Thanks, I was worried you were-"
"It's just that time of the month. You're not used to it yet!" James laughed and sat beside me. Remus was chuckling along, which was a good sign.
"Alright you two gits, let's go to our work now." I smirked at the two as they simply rolled their eyes at me.
I began tracing one part of the Grounds onto our map and James the other while Remus re-studied the one spellbook.
...
Once they were done tracing the Hogwarts' Grounds onto the Marauders' Map, I began explaining the spells I had found.
"So, I found three spells, as you know I told you about. One was Homenum Revelio, which reveals human presences in the surrounding environment. Now, Hogwarts is an environment, right? So it's always worth a try, I figured." I paused to catch my breath, "The next one is the Protean Charm, which causes copies of an object to be remotely affected by changes made to the original. So, if we were to have children and they're all friends, they could be the next generation of Marauders! We could pass on our map and they could use it throughout their Hogwarts lifetime. And, last but not least," I paused again for the same reason as last time, "Specialis Revelio, which causes an object to show its hidden secrets or magical properties. Every secret would be known to us! Not just the secret portraits, but many other secret chambers not one person would know about!"
I paused, waiting for some sign to show they had heard me. James and Sirius looked at each other and then back at me.
"Quite impressive, Remus." James stated.
"Yeah, they sound good. Let's see how well they work!" Sirius exclaimed.
I didn't need to be told twice as I drew my wand, looked back at my notebook to remember how to pronounce each spell, and began casting at the map.