@Thrembs:
That's all quite true. If you take this fully seriously, any romantic relationship is definitely fraught with ethical problems right now for one reason or another (likewise, if the guy is anything but "just a machine", his researcher friend just dumping them on our protagonist without proper explanation just to see what happens, as sort-of seems to be the case, would be vaguely monstrous).
On the other hand, thinking through the actual ethics of this sort of sci-fi/fantasy comedy-of-errors is arguably possibly an exercise in futility. Of
course stuff happens to make the protagonist flustered and have thoughts he perhaps shouldn't. Like we know from the first pages this is probably going to be one of those "bystanders egging it on irresponsibly" affairs. And at the end robo-boy will almost definitely have magically gained whatever thoughts and emotions are necessary to keep up his end of the relationship (...in the eyes of the author, at least; who knows what that will mean).
(And since this is so far a lazy sci-fi setting, it's difficult to gauge what exactly is going wrong or not. Like, on the one end of the scale, I could so far make a (absurd, but not impossible) argument that
maybe robo-boy is totally self-aware and sentient and capable of making his own decisions but just puzzled by human behavior, like an alien. At the other end, I could argue that by all evidence
so far robo-boy is programmed to follow orders, or at least we haven't seen evidence to the contrary, and so the consent issues go
way beyond intellectual-ability-to-give-consent. Both, however, would just be me making assumptions at this point. At the end of the day I'm kind of expecting this to be more like fantasy than sci-fi, and just hand-wave all the details that aren't important to the desired narrative.)
In the meantime so long as this stays bubble-gum ignorant of the ethics violations it's committing, I'm okay with it. There are no rules-of-thumb on how to ethically conduct relations with a would-be-person like this either IRL or in-setting, and the protagonist demonstrably isn't terribly wise or bright and can be forgiven for not connecting the dots, or so I feel. And so long as the
author doesn't start trading overmuch on the "robo-boy is like a child" card to deliberately fan up some sort of shouta theme, I'm willing to just accept that no one's really thinking this all the way through, and it's fiction, so that'll be fine.
But that's just me. And I totally had the same reaction as you, even if my response to it was "eh, that's probably taking this sort of premise too seriously". But objectively ethically speaking, this is indeed arguably basically just a gay Chobits as it stands—that is, totally sketch—just slightly less overtly.