No, they are truly a in a brother-sister relashionship.
SPOILER AHEAD !!!
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the novel did not specify it (or i forgot), however he did fall in love with a girl from his academy.
Can you please give me the link to the novel??
Well no it would be his half sister. If she and Hui have a child.
It's his cousin.. Because Damian is the ML nephew
Hopefully he can have boys without incest
They're not siblings -Demian is Hui's brother's kid ( I think)
SPOILER
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Damian is Hugh's brother son with his sister (yes incest)
Evengelica (Hugh and Lucia's daughter) are cousins to Damian
They will not married, Damian is protective like a brother would do
So... Demian will fuck his cousin? (Lucia's child?)