
Another possible plot convenient annoyance till now that finally got addressed too.
I hope Sensei will provide an explanation rather than just pointing out that she hasn’t forgotten about it, be it
- whether simply because he grew up and is prone to less coughin attacks because his immune system matured
- or because of a more complex explanation (like the Munchausen syndrome by proxy that @akumadeenglish proposed here)

@johnlockcanonsince1887 Ahh, no, that’s not exactly what the Munchausen syndrome by proxy is about. Rather, this is the caregiver (here: possibly real!Ciel) who makes a dependent person appear mentally or physically ill, generally in order to gain attention, to quote from wikipedia.
Of course, this is entirely theoretical and besides, if the answer is anything close to that, maybe Sensei just got inspiration from this syndrome without making our!Ciel’s condition entirely similar to it.
For now, I think it’s just important to keep in mind that it seems our!Ciel’s condition generally got better before reaching 10 years old (as we saw him attending the Easter’s egg hunt)…

…which is why the likeliest idea for me used to simply be that his immune system matured as he grew up, allowing him to be sick less frequently (it’s a thing, really).
Since Sensei took the time to mention it in the newest chapter though, I’m ready to
possibly
consider a more complex explanation, which is why I mentioned what @akumadeenglish proposed a few days ago, but frankly I’m not too sure it’s likely (especially since Rachel was often sick herself, so it makes sense that one of her kids inherited her condition).
While we’re on the subject, @jaena-eowyn proposed that maybe the injections the cult gave the twins might be related to that…

…but for now I don’t think it’s likely either, because our!Ciel never had an attack in 3 years of living with Seb (until that cold shower during the circus arc) and, without going into details, a few injections aren’t supposed to cure or diminish a chronic disease like asthma, at least going by how it is IRL.
TL;DR Ciel’s asthma/coughing attacks didn’t disappear over time as we could see with the circus arc, it just seems that they were/are less frequent than they used to be during his childhood, which is why for now, though I’m not excluding more complex ideas, I’m thinking it’s possibly simply about growing up.













