Bloody Lies

Eugene swore obedience to Logan, the vampire who killed his parents. Eugene, who became his squire, wants to prove his love to him by playing the piano, but Eugene, who has long lost human feelings, cannot express his love. Then one day, Eugene accidentally witnessed Dominic's love affair scene. He is enamored with Dominic's intense emotions as a human, and seeks to learn emotions from him. However, Dominic demands Eugene's body in return, and the two get closer as they mix their bodies...

(Source: Lezhin, translated)