"I've been instructed against assuming what choice of weaponry someone may have by their looks," he replies placidly.
The tent feels surprisingly tough, with little buoyancy. That is, if you prodded it it probably would barely budge at all.

"I believe so. Neither should collapse on us." As if to convince himself that his assertion is true, he gives the nearest tent pole a rather strong tug. It doesn't budge either. 
He then gestures towards the entrance side, which is currently on Caster's left. "Be my guest." 

Sunny peers around the edge of the entrance, slightly leaning down on account of the tent's medium-small size. It seems the host is wary of entry. 
"Good to hear," he half-parrots--likely by intention, as indicated by his little blink at the end. 
The interior of the tent seems vaster once Caster is inside it, and is colored a darker hue than the exterior of the tent, likely to provide shelter from excess illumination. The roof is somewhere beyond him, fading into some distal distance. The boundaries are peculiar, too--the corners of this place seem angular yet also nonexistent. 
Sunny's face disappears from the entrance, and a slight rustling can be heard. Then a faint light sweeps into the interior in patterned blocs. It seems the mage took the roof cover off. 
Perhaps he would make for a delightful house tour guide. 

"Is my presence needed?" comes Sunny's voice, slightly fainter due to the tent between them. "I thought you might enjoy testing the comfort of our abode alone." 
He appears nonetheless in the entrance again, cradling the tent cover. He hasn't had the time to fold it, so it's just crumpled in his arms. 
"My shoes are also somewhat difficult to take off," he adds, sticking his head under the tent entrance to peer at the inside the best he can. The posture is awkward, and a bit funny as a result. 
Well, he is wearing somewhat high tie-up boots.  

"Would you like to take a look at the other tent as well?" Sunny offers.
I remember Solly liking it when she got to choose, he thinks. Maybe he will too. 

There's a pattern inside this one that the other one didn't have. A swirl of some sort, it seems. The cover on top is also a dark green, compared to the other's dark brown. The difference is insubstantial, though.
Oh, also, the zipper to the entrance seems to snag a bit more than the other one. 
Sunny's shadow falls in the entrance again, this time carrying an open bag, which he drops on the floor.  
"I realize it was a bit silly of me to make that offer without first establishing a point of comparison," he states, before promptly tossing a small blanket towards the Heroic Spirit. 

Even sillier. Sunny has a nice vantage point from which to see the mismatched double-cloak. Maybe despite himself, he chuckles. 
"How majestic," he comments. "You look like a wizard now." 

There's a slight pause before Sunny answers, "I am but a weary traveler, come to consult the great and mysterious wizard for a drop of his infinite wisdom."
Impressively, he keeps a straight face, considering how his arms are draped in other blankets. Why does he have so many small blankets anyways?

"Instructions unclear, I will now proceed to dive into the stream." Sunny says this stiffly and then starts a'walking all zombie-like out of sight. Somewhere towards the stream's direction, one would presume.

It turns out the mage waited before being given the command to. He stands obediently a few strides away from the entrance, watching Caster intently, and asks: "I assume the great wizard would also like to obtain some water from the stream?"

"You may stay in the tent if you wish to," he says more normally this time, turning towards the stream as he does so. "I can bring you some water back. I bought a few canteens."
Of course he'd bring "a few" canteens.
Sunny takes the time to put down everything he has in his arms in the other tent before he strolls towards the water, giving a quick glance back to see what Caster is doing. 

That gives this narrator the image of a cute little rat, and it's really funny.
Sunny's silence is supposed to be taken as affirmation.
Well, the two head towards the stream, where Sunny briefly evaluates the movement of the water and surrounding hints of life before filling up the largest bottle all the way up to the brim. He then wanders away from the water, careful not to spill any. He eventually kneels near a log, which he moved away from the tents and for which he cleared away most surrounding debris. Set up in front of it is a kettle, mounted above a fire base.
He's trying so hard not to give a formal invitation to Caster to sit on the log again. After all, this is their base, not just his. Hopefully the Heroic Spirit feels enough ease to decide whether he wants to sit or stand as Sunny continues with preparing the water.

Caster comes back just in time to see Sunny's hands burst into flame. Fun fun.

Sunny's eyes are steely, unblinking. From a certain perspective, his stance could be described as if he were in prayer.
But then of course, one would see the kettle filled with rapidly heating water, and the perception would disintegrate like a mirage under the sun. 
Then with a spark, the flame finally reaches the fire base. The boundaries with them now broken, Sunny retracts his hand as quickly as one would when, well, touching a hot stove. 
"I nearly forgot that drinking directly from the stream would be unwise," he comments to Caster as he tucks his hands into the cusps of his arms. 

"Ah, that." He ponders that for a brief moment. "That wouldn't be a large issue, but I suppose that would be the usual solution."
He shifts a bit to the side. The sunlight from above pools on the top of his head and forehead, illuminating his eyes.
"So what would you prefer? Would you prefer to stay here, or head to the city?"