
I just wanted to add something. Going through the amount of traumas Togane had to go through can greatly age a person maturity wise in many ways, but can also stunt/block a person's maturity level in other ways. Togane and Yorozu are very similar. They both shoulder all the problems, keep it bottled to themselves and have that "I'm fine" mantra down. And while Togane was able to help, nudge or be a catalyst for Yozoru to get out of some of that minset and rely on others sometimes, he was not able to get out of the mindset himself or maybe even see it in himself. This is more common than you might think. He needed someone to help him out of it and Yozoru was the one to do so. There is so many things that contribute to one's maturity other than age. Life experiences play a major role in it. They both had to grow up faster than many at such a young age, which left them lacking in other ways.
Another thing that could be at play is Togane's heart. I can imagine having gone through something so horrific and pretty much having to figure everything out on his own from there, his heart is still fragile. Part of it could of been his way(more unconsciously done) of safeguarding his heart.
This one started out with such an interesting/compelling premise, and then forced the characters back into the BL mold, losing track of all of its innovation. The whole inherited "love hotel" thing that the uke wants to run, and how he performs work around the hotel was interesting. The pr0n-industry seme seeming as if (to the uke) that he's after the uke's underage brother, when it's just the seme missing his own brother, was very compelling. Life completely dumping all over the uke and his family in the bridge section was a great bit of juicy plot maneuvering.
This was all such a great set up. But then it trips and falls on its face.
First of all, let's get the uke's behavior out of the way because I'm really going to rip the seme apart and I want to explain why none of this is the uke's fault. The uke is effectively the man of his family, even if he's only 17. His father died, his mother works but isn't in great health, it's his job to help out at the hotel while he can, manage his little brother, etc. All of this has to be worked around his duties as a student, which, being on scholarship, means he has to work even harder than most just to stay on top so he can even _continue_ going to school. The uke has A LOT on his plate before the seme even shows up, and the uke isn't even an adult yet.
So, when a crew comes in to film a porn at the hotel and the director seems to take a suspicious "liking" to the uke's little bro, the uke is completely justified in being concerned about it. If this was a real story taking place in the real world, no joke the director would be suspected of grooming/going-after the kid. Now, Yorozu's method for dealing with the potentially naughty director was a bit far-fetched, but it was certainly devious, and got the job done (although it relied on the seme's promises being trustworthy, which.... *shrug*). A more adult way to deal with it would've been to talk it out, but given the uke is only 17, I think it's excusable that he chose a derpy method instead.
That said, the entire plot could've been circumvented by the two having a conversation at the beginning, which is not good news for the quality of the plot.
Anyway, after this compelling intro, we then have a role-reversal between the uke and the seme about half-way through, where the uke starts having to be an adult even though he isn't ready, and the seme starts acting like a childish kid, even though he's old enough and mature enough to know better than to behave like that.
Togane's childishness makes the whole back-half of the manga frustrating to read. Even if Yorozu was intentionally deceiving Togane since the beginning, he didn't really deserve to be treated like a thrown-away piece of garbage by Togane. Yorozu is a vulnerable kid in an extremely bad situation, plus his concerns about his brother's well-being were legit. He needed support and all the help he could get, not abandonment without a word. Togane is the adult here. It is inexcusable that he didn't just sit Yorozu down and explain to him why they should break their relationship off. ESPECIALLY after learning about all the hardships Yorozu was having to go through. Closure would've been better for Yorozu than constant fretting over whether they were still a thing.
And also, come on. Togane basing his entire ditching of Yorozu on seeing Yorozu at the festival with a girl and then not talking to him about it is the sort of trashy, forced-separation trope based on illogical lack-of-communication that is inexcusable in a manga with this good of a setup. (or relying on the observations and judgement of a straight guy about some other guy's as-yet-undefined sexuality, wtf even. ASK him about it, Togane!)
Again, I should reiterate that Yorozu is in high school. He is still figuring himself out. If he finally decides he's gay or bi, that's completely his call to make. Togane trying to force straightness onto Yorozu is only there to generate/extend the drama. I can't stand reading this trope any number of times it comes up in various BL comics. The characters are the sexuality they believe themselves to be, not other peoples' judgements of them.
So needless to say it is immensely frustrating to watch Yorozu go meet Togane after he comes back from Kenya, because Togane and his childish behavior doesn't deserve Yorozu's devotion. Togane was the one who screwed up and screwed everything up, and should instead have to chase Yorozu to make up for it, not the other way around. Please stop forcing the uke to take on the burden of the seme's bad behavior!