Asexuality is more of a mental thing, Sexual arousal can be a purely physical, although in this case Tsugumi actively seeks out Megumi, most of the time its bc of his heat so technically he's under influence and its not the "real" him if that makes sense. He's usually very chill and doesn't go out of his way to do anything sexual
Asexuality is the lack of sexual attraction to others, or LOW or absent interest in or desire for sexual activity. I believe that description fits Tsugumi character very well, but that's just my opinion if u dont think he's asexual then he's not asexual. The author hasn't confirmed anything so no one is right or wrong.
As Hemi already said, Asexuality is the lack of sexual attraction to others, or LOW, OR absent interest in or desire for sexual activity. They can still like sex.
They are just not sexualy attracted to other people. That meaning - They look at someone, can logicaly register that that person would probably be considered good looking. But they don't really understand why people would want to imagine having sex with them based on that. Asexuals dont really register people as "sexy" I guess? It's hard to explain. But it says close to nothing about their libido.
It has just ocured to me, but is Tsugumi an Asexual by any chance? Because that's the vibe i got