I agree that karino categorize as sadist. But maybe not azusa. I mean I don't think he is masochist. At the moment he is in dominant & submissive relationship. Which his role is as submissive. But it still unclear if azusa developing any trait of being masochist. I just think that he is doing his role so he can get back to karino (I mean the sworn thing he said at the end of chapter 4 that he want to make karino suffer or something like that).
But the key to masochism is that there has be be some sort of pleasure derived from the pain, and it is usually sexual pleasure.
Accepting pain or wanting something that is sometimes painful is not the same as enjoying and seeking the pain.
I agree that I dont have the knowledge to see the difference between them as I tend to stay as far away as possible from these topics. Really I think we just see his character in a really different way so to me and others he just isn't while to you and some others he is or seems like it. I'm gonna be truthful and say I dont see it at all so unless the manga makes it clear I still see him as someone that just enjoys good sex not pain, now if he were to stop fighting and accepts all karino does and ends up with him I would see him as one and stop reading. I'm sorry if Im offending you by saying this but even after seriously thinking on your points I still don't see it. I think the best thing for us to do is to agree to disagree. Truthful though I think he is gonna become one and end up with karino just because I'm familiar with this authors works so hey I better be preparing my tissues
Karino is a sadist= a sexual perversion in which gratification is obtained by the infliction of physical or mental pain on others (as on a love object)
2. delight in cruelty
Azusa seems to be a masochist.