Kinda has this premonition too, but there was also a chapter where Chloe's birth was revealed, no?
I don't know but I read below they are not so it's all good.
As far as I remember, Chloe had a slave mother, didn't she? If she did, I don't think she is his sister
She is the daughter of the neighboring king and a slave woman, her mother died while giving birth, that's why she grew up at the apothecary, where she was born.
Please don't let these pretty motherfuckers be siblings (╯°Д °)╯╧╧