"You still have to learn the spells the normal way but then you get to talk to people and convince them to do whatever it is you wanted them for. Probably you want to learn Cam's style of summoning, it'll be faster to learn and more powerful to use."

"Uh-huh. It's not going to be blue, though. - maybe convincing them to make planets will be blue."

"Why shouldn't it be blue?"

"Making stuff isn't blue and ensuring that sets of rules are appropriately thorough and complied-with isn't blue and one obvious thing people will want them on hand for is combat operations and that has to be grey."

"The daeva aren't grey, I don't think you can use them in combat operations unless your plan is to just dare everyone else to do anything about it - in which case why bother making sure the summoners are."

"Some of them'll be grey soon enough if summoners become daeva."

"I think you'll have to rework everything to do with expected population, including greys-only combat treaties, if you make some of your population indestructible. Unless, again, you're just daring everyone to do something about it."

"That is definitely not what I would prefer we do about it but it's going to take some finesse to make sure no one does.The extra planets should help a lot."

"Anyway, until there are Amentan daeva you could probably make a case for talking to them being diplomacy."

"I guess everyone who didn't buy an airport will be pretty eager to get in on all this magic and might be on board with that."

"Speaking of airports, unless you want this thing detailed down to the potted plants I have it specced out now, three cheers for computer aided design and this nifty utility that simulates pedestrian traffic flow. Was I at some point going to explain IUDs to some people?"

"Yes! I can have them brought in now."

"...here, or do you have someplace slightly more like a lecture hall?"

"Couple rooms over. It's not all that differently designed but it's bigger. While they're on their way I might have...advice for going over well, culturally?"

"...okay, hit me."

"There are lots of countries that are sexually liberal and make the math work out with poisons and infanticide, in those countries this'll just make the math work out without that and it'll be great. Maybe Osirion will eventually slide down that road but no one wants it to, and no one's going to be eager to shove it. But there are problems which people care about which it solves, like poor hardworking city families with more kids than they can afford to feed and minor nobility splitting and splitting their inheritances or shoving all their excess kids into dangerous occupations. Your - ideal introductory case here - is a harmonious family with four kids who can't care for and educate and marry a fifth or sixth. And then we can add some edge cases, like obviously prostitutes should have access so they don't kill their kids, but that can't be the public face of the thing."

"Okay."

Then he can shoo lots of church people into the room for the talk.

Cam puts up a big screen, light-projected like his handheld computer. "Hi," he tells the audience, "my name is Cam. What've you all been told about what you're doing here?"

"You're a visitor from another planet. That planet has technology that enables women to avoid pregnancy, and there is interest in introducing it in Osirion so that family sizes can be smaller."

"That's correct. There's also the equivalent for men - and more than the one I have a presentation about for women, but this is I think the best combination of reliability, ease of introduction, low-maintenance, etcetera. It's called an IUD, which in my native language stands for 'intrauterine device' but has been rendered into its own word over time." Slide. "Looks like this. Inserted into the uterus like so," slide, "it's nearly one hundred percent effective at preventing conception - until it's removed, whereupon fertility is immediately restored. Side effects include cramping, spotty bleeding, and rarer things -" Slide, list, he reads it out. "Questions at this point?"

Do women insert it themselves? How long does it last? Does it interfere with marital relations? In the very rare cases where it causes lasting problems, are they the sort a Cure spell handles?

"No, they don't do it themselves, I'm going to tell you guys how. If you'd like to, say, rethink the gender balance of this group for that reason, I'll wait. Fifteen years. Very rarely someone will claim he can feel the string and if that bothers your patients you can trim it for them. I am not intimately familiar with the capabilities of your magic but I believe it handles wounds and infections both, am I right?"

It does do this! They will probably only have women do these surgeries but their supervisors should still know about how everything works. 

Sure. So here is a speculum and here is what petroleum jelly is for and so on and so forth.