AU: After she returns from Edolas, Lisanna realizes that she has been replaced by Lucy. Even her siblings seem to be entranced by Lucy, and forgotten about her; despite her return from years of disappearance. Unable to fight against her misery she begins to lose her sanity, but no one notices. She decides to leave the guild, which is granted by a sorrowful Makarov. While she leaves, Natsu takes notice to her strange behavior, and approaches her. Lisanna ignores him, and continues walking. She eventually makes it deep into the forest, with a prying Natsu behind her. She grins manically as she began to plan. Lisanna sees him as an enemy, knowing that they were once close together but yet he abounded her. She uses her hatred and sadness as her motivation. She then murders him after a short argument with him.
Her revenge was satisfied.
I should have put a trigger warning at the beginning! T_T