Imagine Vampire Lord!Diavolo receiving a sacrificial human as a gift. He's delighted but pretends to act horrified and sympathetic to the poor little thing's plight. Blood tastes horrible if the human is terrified. So, for months he lulls them into a false sense of security. Lavishing them with care, gentlemanly behaviour, and isolation for their safety of course!
Let the human delude themself into thinking they had a choice. Vampire Lord!Diavolo mouth waters at the thought of their favourite pet voluntarily offering their blood to him. By then, the trap has long snapped shut. Pleaseee we need more gilded cage, manipulative Diavolo because the potential is limitless!!
A/N: I might've gotten a little carried away with this one.
Vampire!DIAVOLO x gn!Reader, 2.3k words, nsfw, dark themes/content.
Content warnings: canon-typical vampire behaviour including biting/blood drinking, predator/prey dynamics, kidnapping, coercion, manipulation, implied isolation/imprisonment, minor violence, pet names, some sexual content.