"It's fine. He wouldn't be able to get a firm grip, anyways."
That sounds like a slightly more mature version of "I didn't want to hold him anyways." You know, the deflection excuse. Mostly used by little kids.
Anyways, Sunny's back to peering at Caster's head again, maybe out of concern for the other's scalp. 
"Does he live nearby?" he asks.

Sunny sees the sparrow off with, well, his eyes. Then it's back to business.
"What do you think of this place for shelter?" he asks carefully. 

"Bystanders are unlikely, seeing as the surrounding areas are off-limits for tourists." Sunny seems to be carefully watching the other for any reaction, perhaps due to the implications of what he's saying. "This area itself is not protected, but I suppose you may have an opinion on the prudence of staying here in regards to possible effect on surrounding wildlife? Additionally, relating to the War, I do not suppose this is the wisest location in terms of strategy, but I could very well be mistaken."

"That is a good point," he agrees.
It sounds like he was about to say something else but then cut himself off. Instead, he gazes thoughtfully-- back towards the direction they came from. Then his gaze swivels around in a semicircle, sweeping towards the deeper portions of the wooded area they currently stand in.
"Then what do you think about staying here momentarily? In the next few days, we can explore our surroundings cautiously and move if need be."

"Of course." That seems to signify agreement on all the points Caster brought up. "I assure you, I take this matter seriously, so I will try my best to avoid making blunders this early on. Especially relating to locational attachment."
Why does he sound like he's the Servant? Weird.
He tilts his head slightly this way and that before finally taking a few steps forward again.
"Well, then, please make yourself comfortable while I set up our residence. Would you like a chair?" Almost as if proposing an alternative at the same time, he looks over at a wooden log. It looked somewhat polished when he passed by it earlier.  

"Ah." Sunny blinks at Caster approaching himself, but recovers quickly. "By that, of course I mean..."
He takes a careful step backwards and then, with his right hand, flourishes a rather hefty bag towards the side dramatically. Specifically the side Caster's not on, of course.
"A tent!" he exclaims enthusiastically, with a complete poker face. 
Where did the bag even come from?

"On the ground," is the reply.
Oh hey, there's his original personality.
"I assume you see that area as being a better pick?" he adds, swinging the tent bag awkwardly in the direction in lieu of pointing with his free hand because why would that make sense.

"And that would certainly not do," he states with serious but otherwise blank expression. It seems he's mostly waiting for Caster to judge the area he indicated, though, since he doesn't add anything.
It's a good distance from the water and is about as clear as this clearing gets. Plus there isn't an ant mound near it or anything like that. It seems like a reasonable choice at the very least. Maybe Sunshine had plotted this area out in his head in advance after all.

"I believe I brought a repair kit for the tent in case any damage does occur." An implicit wish that something like that doesn't happen simply isn't voiced. Instead, Sunny sets down the bag he's holding next to a rock and gives the area another visual estimate.
"Please feel free to take a seat and rest for a while," he says to Caster, his gaze landing on a rock nearer to the trees as way of suggesting where to sit should Caster find it hard to make a choice himself. 

Within the span of the few seconds that it took for Caster to find his spot and sit down, Sunny managed to take out a sizeable portion of the contents of the tent bag. More specifically, all the frame parts. Given, they're all wrapped up in individual bags for organization purposes, but it's still impressive.
He's staring at a particular bundle like he's sizing up an enemy. 

Sunny does what looks to be a small poutish scowl at the bundle before begrudgingly starting to open it. 
A stick immediately juts out in an effort to impale his right cheek. How cute.

(I dunno lol, but it sounds like if Caster isn't gonna do anything else it'd be time for a timeskip)

(Y'know what, after some more thinking, what I'm gonna do is put this AU on hold until further notice as well. It doesn't feel right continuing it, at least as of right now. Thanks!)

(Feel free to not respond for awhile, I'm just putting this here to get it off my mind for a bit. The biggest problem atm is that I don't know how I can get Caster to interact or Sunny to be less boring :') )

After expertly dodging the tent stick's murder attempt, Sunny gets to work on setting up the frame and connecting the fabric portions of the tent into their proper locations. 
To be honest, it's boring work when you're not being a part of the process. But at least Caster gets to see the thrilling moment when the tent's shape is finally sustained--specifically, when Sunny finally gets the last pole to bend like it should, and everything doesn't just explode and force a complete do-over. 
Though, he probably gets to see this twice, since Sunny sets up two tents. 
It seems the mage in question is accustomed to being watched, since he doesn't look at Caster or move with unease the entire time. He's clearly comfortable with the actions he's doing, like he sets up a tent every other week. But still, it feels like he can't quite be called graceful. There's a strange contradiction to him, perhaps able to be represented by his attire. As mentioned prior, he's wearing a nice jacket, but beneath it, Caster can now see that he's wearing white, which is a particularly peculiar choice for the wilderness. 
Hey, look, he's looking at Caster now. Maybe now that he's done, he wants the other to come over and scope out their residence-to-be?

Sunny merely stands completely still as he's approached, and only exits his trance-like inaction when the other claps.
"They are," he affirms with a brief nod of his head, and adds: "Bulletproof as well."
He pauses.
"I assume you will not be in need of bullets yourself?"