Ah, so you want a scene where orcs rape and enslave women? That can be arranged, but your interests would be better served through a few works of art that I can recommend to you in private.
Ah, no. I'll stick to consensual sex, thanks. I asked because the big guys don't get a lot of exposition beyond 'waaaaagh!' and 'FOR SAURON!'
Some settings do it (namely, the Elder Scrolls setting), but it's generally the noble savage archetype.
I have a soft spot for them as a reader, so I am looking forward to exploring some possibilities.
If a single rape can break them mentally they are practically worthless for what you want, since their mental strength is so weak that even if you translate that into loyalty, it will not amount to much. So no, the soldiers aren't doing the hardest part. They'll be traumatized, but that doesn't mean that they're absolutely broken. It's not like they encountered some super grimdark edgy event, being chained in dungeons and gang-raped by trained animals and tortured by having a single bone in their body removed every week.
Well, they had their village destroyed, their parents are probably dead and now this happens. Yeah, I would expect them to be extremely traumatized and very unhinged in the first few weeks, which is where we would come in as a stable, reliable 'counselor' and pushed them in the direction we want them to go.
I'm not saying they would be broken to the point of hysteria, but rape victims are usually become emotionally fragile immediately afterwards.
But then, this universe operates on anime rules and I'm not familiar with those.
Rin wouldn't care about the kids, only as a way to betray us down the road perhaps, and Petze, well...
Save them or let them die. Adding extra effort for a long term master plan to cultivate two illiterate peasant minions who are perfectly loyal seems a bit strange and out of the way when you have a lot of other perfectly loyal minions at the moment. I can understand it if you suspect they might have hidden powers of some sort, or are secretly important in other ways, of if you triggered the event where the goblin village was wiped out, but if that's the case, that's the argument you should be making. The idea might catch on better then.
On second thought, let them die. Destroyed village, dead family, this is the stuff successful heroes are made of, we don't need any of those running around.