Bonkaimon au. Bonnie and Kai are soulmates destined to be together in every lifetime. Kai is struggling with a serious magical problem and Bonnie might just be the solution. Things get a little complicated when he finds out she's married to his brother, Damon.

Necessary evil - something bad that must exist in order for something good to happen. Bonnie is sick of vampires destroying everything good in her life and she wants revenge, so she seeks help from the most vindictive person she knows - Kai Parker. The two unlikely allies work together to rid Mystic Falls of vampires, but Kai has a secret agenda that could ruin everything.