Sorry to shock you but they're blood related this is an omegaverse, so there are involved animal instincts. When the uke went into heat at 16 his brother was next to him and got accidentally attracted by his pheromones so he developed some kind of obsession towards Hana, even cause they've been separated for 10 years so they're basically strangers... I'm sure the story would've told us if one of them was adopted. But I also think it's disturbing, it was better if the author used a childhood friend Idk
Maybe they are step brother
Someone x mom———dad x someone
(Hana). ( aoba)
That's half brothers stepbrothers is when they are not blood related at all their parents are just married
That’s what i was saying
It's what you were saying but to me it sounded like you were explaining it as a half brother situation
My bad sorry
I was saying that maybe their “mother” x someone = hana
Their “father” x someone = aoba
In my mind him and the brother aren't biologically related the uke is like adopted or something that's the only way I can process it