
I think that the first kiss they had was seme confirming his sexuality + attraction for the uke. After that he propably realized he is into uke hard but the uke never took him seriously becuase he is younger. Serious tsundere issues. It would suck hard if you were into a person for years and they were into you too but it would never progresses beyond a kiss.

Whoa there is a lot of people hating this manga, I understand that incest is putting off a lot of people but I don't remember anyone glorifing it in the manga. I actually liked that they added seriousness and reason behind Hue's actions. And also the world became way more interesting to me not only thier relationship. Also my theory is that Lucia has a bit of the supernatural blood too, after all she was able to foresee and even go back to the past.
Damn he's hot