Blue Exorcist

It's been three months since Satan's defeat by Rin and Yukio, but like they say,
Once the enemy falls a new one shall rise.
Lilith is the queen of Gehenna, the wife of Satan and mother to the eight demon kings. Since her husbands defeat, she considers the brothers as a threat, and is filled with deep hatred towards them and seeks to destroy them.
Lilith sends for her demons to deal with the problem...but what will happen if one falls for Rin and he falls for her and what will fate might unravel.