The theme slavery is explored the most in my opinion. My reasons for thinking this is nauseous these people are forces led against their will to have en egg implanted in them which hatches and are forced to withstand as they are cut open so the Tlic can retrieve their new born offspring. Gan proves this we he attempts to commute suicide and makes a comment how he never had a say In how his body was to be treated.
In addition to that you have the story that Qui tells Gan about a how a man was impregnated with a Tlic eggs once their inside they hatch, hooking to their veins and feeding on their blood before they’re cut away and transplanted into a dead animal.
But in this case there there was no dead animal that could be used as the host which means they via being eat from the infused and the Tlic refuse to save the man despite not being his fault for why there isn’t a second host for the Tlics and the fact they can still reuse him again they instead view them as property, using them to give birth their children satisfying their needs and if something prevents them from doing so like the requirements aren’t met they throw them away and leave them to die even when the beg for there life. This only make Gan decision to performed suicide more understandable, because at least when he goes out, he goes out on his own terms, rather then anyone else’s.
The call backs to specific and explained points in the story make your BP very complex without needing to over explain which I think gives your choice stronger support
Yeah the theme of slavery can be seen the way they use the terrans.
I agree that the idea of slavery is expressed throughout the entire short story because of the way humans are treated like livestock that holds their alien children.