My Senior Sister Went Mad, and I Became Her Exclusive Human-Shaped Elixir for Her Obsession

[One heroine] [The heroine is a little unhinged early on. If that's not for you, feel free to leave] Yun Xiyue, the Heavenly Evolution Sect's saintess, is the leading figure of the righteous path. Peerlessly elegant, she is hailed as the future immortal sovereign most likely to ascend. Her sword heart is clear and her heart is filled with compassion. In the hearts of countless young prodigies, she is an untouchable white moonlight. Everyone believes she has long since cast aside all earthly desires, devoting herself entirely to the people of the world. But no one knows that whenever demonic energy torments this saintess who cares for all under heaven, she sheds her holy radiance and becomes a madwoman consumed by desire, breaking into the shabby room of Xie Ci, an outer-sect disciple. She pins him against the wall in a frenzy, greedily sucking the blood from his collarbone, and murmurs in a sickly, aggrieved voice: “You... smell like another woman... You're filthy.” “So I'll punish you... Feed me until I'm full with your blood...” “And I'll carve my exclusive mark right here... From now on, if any woman dares touch you, I'll grind her bones to dust!”