Read The Sacrificial Princess Satisfies the Vampire Duke’s Thirst With Sweetness / Ikenie Hime wa Kyuuketsu Koushaku no Kawaki o Amaku Mitasu / 生贄姫は吸血公爵の渇きを甘く満たす
Plagued by a mysterious illness that devastates her body and spirit, Lidy is abandoned by her family and endures a harsh, solitary existence. Her fate takes a darker turn when her parents offer her as a “sacrifice” to the Vampire Duke, Evariste—a being who embraced vampirism to protect the kingdom. Resigned, Lidy journeys to meet him, only to discover that Evariste is far from the terrifying figure of rumor, treating her with unexpected kindness and respect.
shitajirai
Expected smut but was happily surprised by what I got! Seems like this could go down the overpowered MC takes revenge on her deranged family route