I'm not really opposed to the first raw sex scene happening at this point in the story or even how Luca did it except that it seems odd that he would so carelessly break the rules unless it was some plan to further corrupt Laura. I would think he'd be more calculating and that if he chose to go a round without a condom, then it wouldn't be as a "eh, whatever" kind of thing but rather a "one taste and she'll be hooked" kind of thing. however, we just have to wait and see how this development unfolds from here. Luca's actions could lead to some very good development and conflicted feelings for Laura.
I would say that my complaint however, is in how it disappointingly it was done. We've had points in the story where Laura was either barely conscious or briefly unconscious before, so it doesn't seem to like it would be too unusual for us as the player to get to continue watching despite Laura's state of mind. Everything up to that point, while very titillating, felt like edging but then skipped over the climax. The whole time they're going at it, there's too much back and forth and not enough pay off at the end. I understand the whole idea of wanting to jump from her adamantly mentioning how important that rule is to the point where Luca breaks it. It has a lot of merit for an idea, but I think it might've been better with an extra line or two before the fade out and then jumping back in right as he realizes he's out of condoms.
Overall, I think HC shouldn't get hung up on this point too much as we have several paths to explore and I suspect that this milestone will be handled differently amongst them. Some will obviously be better than others and so once we see the other endings, this might eventually become a forgotten complaint. Either way, write what you love HC and I'm sure you'll do fine. Don't worry about our bitching except for if it offers you some constructive criticism. Your game is remarkable and will continue to be remarkable no matter what happens!