
Physically yes, mentally no. But if they end up together it’s still considered incest since they’re born from the same mother. Unless in the future chapters it’kk be revealed if Charlotte was adopted, then it’s not incest.
Althouh it’s still very weird on Lucas side. Can you imagine falling in love with someone with the face and body of your sibling?

Depends on what you mean by incest! If you mean sibling incest, parent-child incest, incest between aunts and uncles and their nieces and nephews, etc. this was very very uncommon and socially unacceptable. Even in fiction, it was a topic that elicited horror, and its depiction there seems to have haunted the Middle Ages; familial incest such as fornication between brother and sister or father and daughter was a sin as well as a crime. When it was found to have occurred among commoners, it carried penalties both secular and religious, and might be punished by prison, exile, or death. When it even reputed to occur among the upper classes (think the Borgia family) it was a source of scandal.

Well... Japanese are known to like incest and even don't see a lot of problem with it...
Still, I hate incest and I feel it is still incest if one of the siblings is adopted! I have an adopted brother and honestly for me he is my brother, it is gross imagine anything happening between us, for me that is also incest because we grown up as siblings!!!

me and my cousin went to the same school together we were 14 at the time we had sex ed and we saw are best friends having sex and they were sibling it was the same day of that class we just watched it then we went home and just talk about what we saw then years later we found out they had a child after we moved away.
If they're not really related?