Heh, yeah, it is a bit convenient for the plot, but I think we’re meant to believe that they did just fall for each other that strongly. We can take the servant goo out of the equation, but even putting that aside, they do tell us that with the free will plasma, people don’t feel the same. My theory is that Kendry was already such a ruthless terrible person without it that becoming Hullen wasn’t much of a difference. s1 and s2 Kendry meeting Aneela would pretty much be the same as s3 Kendry, right. Even though she’s new to it and has to be trained away from her “human” thinking, as Gander and Aneela both point out, like, what human thinking, the scale of her thoughts may be too small for the Hullen, but this was a murderer who casually used children as tools.