Sure. Good break from brainstorming on the war, perhaps something else will pop into your mind while you do it. 

And he introduces them to the pilots.

Emily, in addition to how to fly them, wants to know all about how they're put together, since angels need that kind of information to make things.

They have blueprints, and can explain in exhaustive detail.

Emily is raptly appreciative. Eidetic memory is so great.

It is! And after a while they break for a meal and Maitimo asks if they've had any thoughts on landing secretly on Earth.

Edie has not, but Emily has! Nerding and learning how things work has so many benefits.

If they think they can pull off a stealth landing, he'll trust them with the details. 

Should be totally doable!

They redirect the lightleapers again. The computers warn them that doing this too often will run them out of fuel. Maitimo frowns. "Technically I don't think mid-leap demonic refueling's been tested, let's make this our last course change."

"Good idea. You guys can wait just outside the system, right?"

"Yep. If we'd be noticed by local sensors from there, we can wait well outside the system, too, and be in in a day."

"Perfect."

They arrive about a lightday from the system's sun. Secure protocols for communication are established.

"Good skill."

"You too."

It's an uneventful trip. They hide the vessel somewhere convenient and walk to their possibly-sister-ish-person's workshop.

Earth is exactly Earthlike. It's uncanny. No differences at all, except that they didn't live and this person apparently does.

It's so weird. They get there. They knock on the door.

She opens the door. "Yes?"

"This is really awkward, can we come in?"

"...Sure, why not, she says, opening the door wider and standing aside.

She doesn't look up, she's changing around some electronics and that requires concentration. 

"So I know this is incredibly hard to believe but my name's Emily Xavier and this is my sister Edie and we're--actually daeva, summoned from a parallel universe, I'm not sure how parallel, and this planet is rigged to blow."

"That's incredibly hard to believe but if it's a prank I would dearly love how you pulled off the planning, let alone the execution."

"Rigged by who, and to blow up when?"

"Humans aren't the first sapient species in the universe. Aside from the people who summoned us, there's one that died out millions of years ago. Mostly died out. There are fifteen of them alive, and by 'alive' I mean 'in catatonic suspended animation while their unbound daeva do whatever the fuck they want.' And one of those catatonic summoners is in the center of this planet. The demon whose summoner it is is very very evil and rigged the planet to blow if the summoner dies."

"...just really far away in Heaven? I would not have expected us to miss that - anyway, if it's been that way for millions of years, it is probably safe for the medium-term, right?"