For me it's less about them being siblings but not biological, but the fact that he treated her so poorly in the past life. I know it's the past life but if he had the mindset to do it before, he could do it again. It's like Hari has forgotten what they did to her and that trauma. Also, it's not...
He's really getting mad that she *may of* slept with her ex-husband, like dude you raped, tried to murder her, and ruin her life multiple times. You may be hot, but this ain't Riverdale and there's no endgame between you two.
Anyone who's into lolis is sus af. They're literally based off children body and even age at times. Fuck that "oh no, they're actually 5,000y.o stuck in the body of a damn child. You're a pedo in the making.
The summary for this comic doesn't do the the story justice, my gosh is it a ride. I love this story so much, but when he said sister I was about to yeet.