Sunny spends the rest of the time eating like a turtle who's on a schedule. Regardless, by the time he's finished, his plate is ridiculously clean, like he's washed it.

"But you have to finish the plate," Sunny says, gesturing vaguely with his fork.

"No, Mum and Pop said you have to eat all of it yourself!" Sunny counters, crossing his arms.

"Awww, fine," Sunny gives in.
Well that was quick.
Anyways, he yanks her plate to himself through the air and starts plowing through the food in a manner unlike his former one, probably afraid he'll--they'll--get caught by their parents.

Sunny stops chewing for a split second to tuck in a glob of chewed-up food under his tongue and then stick out said tongue at her to prove a point.

Sunny gives in quickly and almost smiles before he scoffs and returns to wolfing down the food.
"Hmm? Sunny, you aren't eating Lux's food for her again, are you?" comes the voice of two certain half-demigods' mother from somewhere down the hall, also causing Sunny to nearly choke. He quickly recovers, though not before it looks like he was about to swallow the entire plate. And table.

Wow, real considerate. xD
Sunny shoots her half a glare as he takes the time to gag a bit from a choke he just swallowed.

The thing is, Sunny's usually a paced/moderate eater, not to mention that she left half of her portion. So try as he might, unless he actually eats the entire plate, he won't be able to finish in time. And also...he already ate his own portion, of course.

"Sunny?" their mom's voice goes, now even closer.
He's...not gonna make it.
Oh, that sounds more like the narrator saying he's gonna die. That isn't the intention. In actuality, the narrator meant to convey that he can't eat all of it...and also that he looks slightly blue.

Sunny actually doesn't need to know what his face looks like. In a moment of desperation, he pretty much just dumps all of the unfinished food into his pockets and then threw the plate back to Sollux like a vertical Frisbee.

Sunny meant for her to catch it with their super-cool abilities so that she can pretend that she's done eating hers and he's done eating his, actually.
Anyways, thanks to Lux's super witty and quick thinking, their mom comes into the room just in time to see Lux's plate smash into the nearest convenient wall. 

It takes a second for their mom to realize what just happened, but anyways, in the time it takes for her to do that, Sunny somehow executes a perfect series of actions. That is, stand up, push his chair in reverently, and then bolt past her. And wow, does he bolt fast. 

(Lol xD this just makes their mom seem so scary when in reality it's probably just Sunny and Sollux being some variation of goody-two-shoes xD)

Xenia nearly doesn't manage to catch Sollux, mostly because Lux is a lot faster than she looks and also because there's a height difference between an adult and kid, meaning she has to lean down to execute the action. But somehow, compelled with the power of the narrator not wanting to POV an adult chasing after two itty-bitty kids and also her mom instincts, she's able to scoop up her daughter as if her arms combined were a shovel; and somehow, she's also able to not drop the kid, who undeniably is feeling a lot more like a worm or a snake than a humanoid being. 

Xenia, way too used to this, just softly pats her daughter's back a few times. Well, she doesn't say the stereotypical "There, there." That's a good thing, hopefully. And yeah, she's used to it, lol.

Running away from his problems. Oh, wait, the question was "where." Well...probably somewhere near the outside. That's just how he is.
While patting Sollux's back, Xenia surveys the damage done to both wall and plate (more was done to the latter than the former) and considers the correct course of action. 
Hey, other narrator, she's considering calling for the two's dad, so he might need a name and personality real soon.