Smutttyy

In my opinion it was important that he lost weight to show that the seme only cared about his personality and not his looks, being fat or not, it doesn't change how they feel, and I think this is the whole point of this manga (^.^/)

Well said. That is how I saw it too. Heavy or thin, tall or short, old or young, if you truly love someone, these things are irrelevant. They are still the same person on the inside and that is all that matters.