So you're saying that Asumi shouldn't tell Naruse to avoid Yanagi/getting into a dangerous situation Yanagi? I don't understand your logic here lol Asumi is just worried 'cause he knows how defenseless Naruse is-- that is literally how their relationship started so he knows best. Naruse may not have feelings for Yanagi but that doesn't mean he should be getting into situations where something bad could happen. If someone told me that there was a person who could potentially have feelings for me I would avoid being in a 1 on 1 situation with them 'cause even if I feel like I know that person experience tells me that there is always that possibility of something dangerous happening against my will.
Yanagi has already shown us that he has a very keen interest in Naruse and he's already tried to put moves on him while he was drunk AND with other coworkers. What's to stop him now that they are alone and ONCE AGAIN Naruse has let his guard down and drank? If something happens Naruse isn't the only one who is going to get hurt-- Asumi will most definitely feel responsible for not being able to protect him and we are also risking Ichika's well being. It's not as simple as "Asumi getting jealous/over-protective is bad 'cause he knows that Naruse only has feelings for him so therefore he should trust Naruse" it's more "he's trying to protect Naruse 'cause despite his feelings you can't always trust other humans to use their better judgement." Naruse's life is not just his-- and this holds especially for Ichika since Naruse and Asumi are all he has in this world. If something were to happen to either of them it would stay with him for the rest of his life.
My point is that the onus of this situation isn't on either Asumi or Naruse. Yanagi clearly knows that Naruse has someone special in his life and any attempts from him to pursue Naruse are his own actions and he should own up to them. The fact that we has humans still have to police our own behaviour because other humans don't know or care that no means no is disgusting and draining.
Asumi's jealousy (jealousy, not concern), however, isn't based in reality. His lover is in love with him. His concern is that Yanagi will try something and Naruse will what? Leave him? That shows a lack of faith in Naruse's feelings when all he has done up until this point is try to take care of Asumi. If he keeps prioritising the actions of another over Naruse's truthful feelings, it will not go well.
This is funny. Did you remember Yanagi tried to touch him when they were at the drinking party with colleagues just cos he was a little drunk? You think he won’t do the same right now? Mr. Naruse works with him and can’t avoid him but why didn’t he tell him he wants to go make dinner for his child? While we are at it, if Mr. Naruse knows he did nothing wrong, he would at least mention the facf that he is going drinking with Yanagi, right?
It doesn’t hurt to protect yourself sometimes, you know? And he also said Yanagi reminds him of Asumi, which is why he shouldn’t drink so he wouldn’t get drunk and mistake the two. It’s as as that!
Naruse is trying to be a good colleague, a good boyfriend, and a good father (Ichika's sudden independence has to related).
Look I'm not saying that Naruse is being smart here. He sees a young guy that reminds him of Asumi and he wants to help. He feels a bit like if he can help him he could help Asumi, rather than always feeling like a burden. He isn't looking at Yanagi as someone who has feelings for him so why would he bother to avoid him? He doesn't see the situation the same way as Asumi. And even if he did, the point is Yanagi should not come onto someone he CLEARLY understands is with someone else.
You don't out people just because you know they're gay. Naruse doesn't see Yanagi the way that he wants him to and Asumi is trying to understand that. He's jealous but really he should let it go because his partner has told him: I'm not interested. He's placing more value on what Yanagi might do than trusting Naruse and that's not okay. More importantly, Asumi gets this.
Even if Yanagi kisses Naruse. That's not Naruse cheating on Asumi. That's Naruse being violated by someone else.
And while going out for drinks wasn't the best idea as it lowers inhibitions. They work together and Naruse can't avoid someone at work just because they're interested in him and he's not interested in them.Yanagi should know enough to keep it in his pants and his hands to himself. Yanagi's feelings are not Naruse's responsibility.