They do eventually get together and have s*x when Xiao Yan gets stronger.

Every time he invaded Xiao Yan's mind, it was after something extreme happened. It was always when he was at the verge of losing it.

The one who tried to seduce Xiao Yan was a SEF soldier. Xiao Yan almost gave in, and if he did, the s*x with the female SEF soldier would have cost him life. What Heine did there was remind him of the consequences that he seemed to keep forgetting. A rough way to teach someone a lesson, yeah, but Heine is a soldier, and military's way of teaching lessons is never gentle. Again, Heine wasn't never punishing him for having interest in someone else, although, without doubt, there was some jealously included.

A lot of assaulting in Xiao Yan's mind has been done to warn Xiao Yan. Later we find out that Heine has been trying to keep distance, but Xiao Yan kept trying to make this cold soldier notice him. In their subconscious, Heine loses his control, but it's likely that crushing happens because he wants to show Xiao Yan what are the consequences.

It isn't, actually. The hallucinations can be evoked on purpose, but they can also happen when SEF soldier isn't able to contain his desire. This is why hallucinations happen when Heine and Xiao Yan are alone.

You can clearly see that Heine has started falling in love after visiting Xiao Yan's mind for the first time, when the rookie trapped himself in his own subconsciousness. The subconscious of a human is dark, distorted place, and Heine came in expecting to see hell, but what he was met with a peaceful place and one extremely innocent, pure soul. That pure soul is what Heine fell in love with.

Heine likes MC so mind raping him is okay??? ML can go into MC's mind and defile him there, but MC is unaware that ML does it on purpose so MC thinks he dreamt it himself. Iirc there was one where MC's body was practically crushed in the "dream". ML does this violation more than a few times and it just doesn't sit right with me. Somebody invading your mindscape, basically forcing you to experience something since you're unable to tune it out? It's horrifying. Perhaps the ML has special circumstances, but is what he does truly something that can be excused?

and the third chapter is kind of raising the flag for very very hot... (ahem) moments between our protagonists

First of all, I think ML's self-control is praiseworthy. The premise of the story is that their body type experiences uncontrollable sexual urges, and yet ML holds himself and reins him in every time because he doesn't want to hurt MC. The hallucinations MC sees, that's not ML's fault at all. Like one of the characters said, "he can stop himself from f*cking you but he can't stop himself from wanting to" (in maybe not exact words).

Next is ML's jealousy, and honestly he's not really a jealous character at all, especially compared to typical MLs of other stories. He doesn't stop MC from getting close to his friends and building relationships with others of any gender, including a friendship with his goddess or play flirting with others. The thing about the dislocating his arm was to use pain to help MC break free from the hallucination he was trapped in and to warn him to be careful in future situations. The decisive action is more due to his character than jealousy; he would've acted the same for another comrade even if he didn't love them.

Lastly is the thing about the subconscious. The reason he always went is mostly because he enjoys the peace and calmness of the place, as he said, and not because he was trying to manipulate MC's feelings. He went for the environment, but the things that happen there were mostly the initiative of the MC. At that point, ML is heartbroken that MC won't be able to remember anything that occurred, and due to his physique none of this can happen in real life, so he uses pain as an anchor point so MC can feel that even in that fake reality Heine is there.

However, although I've defended ML a lot, after they have reciprocatory feelings I'm kinda unsatisfied. Like I know he's controlled himself so much that everything starts to break loose and he really can't stop himself, but he's still way too rough lmao, even if it turns out that MC likes it rough.

Okay, so many people have a problem with Heine, but honestly I don't see it. Heine does break our MC's arm when he was 'flirting' with a female SP officer. Why? Yes, he was probably jealous, but there were other situations when he was jealous as well yet didn't harm our MC. The real reason was due to who the MC was quite close to going to bed with (the MC admitted that without Heine''s warning, he probably would've been killed). It was the SP and the Special Forces are apparently quite lethal in bed to ordinary people, and can break their bones and end up killing them without even blinking an eye. Heine was simply demonstrating a small fraction of what could've happened--lest I remind you, this was his second time warning him, and sometimes a physical warning leaves an greater imprint. Other times when our ML is cruel is when it's necessary.

C'mon guys, you can't expect him to coddle out MC in a Zombie Apocalypse. If that happened, our MC probably would've died from being so sheltered. He needed to face the reality in front of him and become stronger. Leaving that, our ML alone is very capable in both brain and ability, and I would call him a wise grim reaper of few words. He's great, says wise and sensible things, and is OP as hell on the battlefield (though he looks aloof and cold, but that's just his personality, even till the end of the novel). I loved him at the end of the novel, and I'm sure you will too if you take the time to understand his character.

Anyway, a lot of moral conflict people had with this story was that Heine send sexual dreams to the MC. Now, I'm not justifying his reasons, but I would like to remind you SP soldiers have a high lethal s*x drive. His intense desire to be close with the MC eventually manifested in dreams. However, he was extremely respectful and gentle of the MC in real life. I would go even as far to say that the dreams were his way of protecting the MC from getting killed in real life before he gained physical ability. Even when the MC wanted to, uh, **** the ML and stirred up his desires, he maintained great self control because he didn't want to hurt the MC.

Now, were the dreams consensual? Not entirely. But as shown later in the novel, our MC wasn't manipulated in liking the ML due to the dreams and actually had some attraction to Heine (though he didn't realize it). Honestly, that whole part is still a little in the grey area, but I still had no problem with it (it's just my attitude which not all of people share, but even those who despise these things still commentated that due to the existing circumstances, it did not bother them as much as they expected on the novel forum).

Heine starts with sending fantasies into Xiao Yan's mind, and this is done deliberately. After Xiao Yan accidentally falls and kisses him, and Heine tries to strangle him to death, and later breaks his shoulder (he used him as a stepping stone to shoot down their enemies, but he should have known it would happen, and there was never an apology.) The guy that comes off as a psycho on the first chapter (Mark) who acts like he wouldn't mind seeing them get eaten, is the one to save him from death in that moment. So somehow, he's addicted to this kid after an accidental kiss he tried to kill him for, that has the MC thinking this guy is out to kill him for several chapters in, before the injuries start to get disregarded or seen as 'tough love' maybe?

And it's only one instance he got injured by the ML.

At some point, while Xiao Yan is at a bar, a woman with the special virus that could make someone addicted to them is sitting next to him, when some other guys start badmouthing a subordinate of Heine. He beats them up. Then, sees MC with the woman, and dislocates his shoulder. Why? He mentioned the names of two people that flirted with the MC, and the one person, who is a normal person, that he's had a crush on for years, but this doesn't sit well with the ML. Supposedly, it's to warn him off so he doesn't get f*cked to death, and the MC just goes along with it. Okay, but I see it as you being jealous.

Then, somewhere along the line, Xiao Yan starts to believe he's fallen for this guy. And while I see the instances where he saves his life, why does that have to be the catalyst for it, when he's supposedly straight, even when the ML still continued to treat him poorly otherwise. In the fantasies, it was forced in the beginning. There was even a scene where he imagined getting done by the ML, and it hurt, and he wanted it to stop. It was only a delusion, but you find later that it was the ML infiltrating his brain, so it's not just his imagination.

Don't get me wrong, Heine and Xiao Yan have their adorable and hot moments, and I love that, but insta-love is either an obsession, or lust, or a crush. And while I don't dislike it, either, show it better, don't go from, 'this guy looks like he wants to kill me' to 'oh, I might like getting kissed by this guy even though I should be straight' even if it's still only a delusion and he thinks it's his imagination.