Oh for fuck sake...
What exactly are the criteria for interacting with the other-worlders? Anyone would be fine within that apartment, surely?
If so, just collect a bunch of rapists or whatever and shove them in there with her.
If not, SEX ROBOTS. ¬_¬
And bringing NTR into this is just crass, on top of the stupidity. At least this chapter had lewds.
Oh... and...
"It's our world's most popular way of splitting people into two groups."
Since when is Japan the whole world? It isn't any more endearing when Japanese do that than when Americans do it.
I guess it might seem like the whole world to some myopic idiot who lives in a cell, but Japan is a rather small country... and the rest of the world doesn't use the terms "S" and "M" like that. Even ignoring the fact that sexual hierarchies hardly constitute a significant metric by which humanity might be divided, I've seen enough manga bring up the topic by now to know they can't distinguish between the "Sadist" / "Masochist" axis and the "Dominant" / "Submissive" axis. Japan seems to have this ignorant tendency to reference the former while meaning the latter.