I Found Mixed-Race Twins and Let's See How I Raise Them

[Alchemy + Darkness + Redemption + Two Heroines + Multiple Routines] (First work by a newbie, please review) I made a living by reselling black market medicinal materials, but I found a "big trouble" that overturned the Three Realms—— The demon princess on her left hand has a blood curse of kin-killing etched on the base of her tongue; the remnant of an angel on her right hand has festered wings like black spots from the abyss. And the creeping brand on the adoptive father's withered neck is feeding the "sister" in the basement into a bloodthirsty monster. The glimmer of alchemy can't save anyone, but it is the glow in the long night: the holy light burns away the wings, the demonic blood burns through the mind, and the flesh and blood of the adoptive father becomes firewood in the abyss. When the peach-colored magic eyes penetrated the mirror, I finally understood the final chapter of alchemy—