The Little Vampire's □□ Contract

A little vampire makes a contract with a biological scientist, providing funding for the scientist's research. After the scientist dies, his soul belongs to the vampire, becoming the vampire's slave. The vampire moves into the scientist's home under the pretext of "investor oversight of a scientific research project."

Before the two of them have even kissed, everyone assumes they've been together for ages. They imagine the scientist as a domineering CEO top who keeps the cute, naive vampire bottom, and come up with all sorts of explicit, unspeakable fantasies.

Later, the little vampire discovers that the scientist is researching "immortality"…

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