Responses

They technically spent a whole lifetime or at least 20 years together because she went back in time so Hari suddenly catching feels just seem kinda... strange to me. I can definitely understand Eugene catching feels but just not Hari. Maybe that's why I don't really ship it. I find there sibling bond cute. Sorry i'm rambling, you probably don't care so I'll go now- #-.-)
1. They are not related by blood, as we saw before, since Hari is adopted.
2. I'm pretty sure neither Eugene nor Hari has ever seen each other as siblings.
I personally really don't like incest, but this situation wouldn't be incest in any kind of way, besides them living together for some time (and hey, many relationships started with the characters being childhood friends, though I know this is kinda different), so please everyone. Stop whining about it. Totally fair if you don't like this relationship, but don't say that you don't like it because it is incest, when it's not. (づ ̄ ³ ̄)づ