Brainiac [Illumi X OC] Oneshot

She was a brainiac. She was intelligent, smart, witty, sharp, knowledgeable... however you want to name it, she was it.

But that was it, that's all she was.

Smart.

When a certain clown introduces a certain assassin to her, how does one get through to an emotionless man? How does one even fall for one, who may not even return those same exact feelings? How does one fall for the oldest Zoldyck child?

Thank you to Minsugabulletproof for requesting and making the cover for me. As well as being so patient with me, this story took a long time to be released.