Since receiving the curse mark, self-control had become rather difficult for Sasuke. Despite the seal Kakashi had given him, he felt disturbing urges to kill, hungering for bloodshed and chaos. It was frightening. What if he became exactly like his brother? Even more upsetting was that he almost... enjoyed it sometimes.
Thankfully, he still had control over his mind and body, even if he couldn't stop the unusual impulses. He didn't want to hurt anyone, especially not the people he cared about (though, he would never admit to having any such attachments).
However, the urges got progressively worse. Nearly every day, a persuasive, hissing voice would talk in the back of his mind, insisting he take a kunai to someone's jugular. No one would care – what was one person in a village of thousands? The suggestions were tempting, and resistance was increasingly harder. The mark on his neck burned, and he itched to let it overcome him.
He would see Sakura, smiling and innocent in her usual red dress. He would wish the garment was gone, imagining her instead covered only by the red of her blood, having been raped and murdered at his hands.
He couldn't hurt her, though. He refused to; the same way he refused to hurt any of his other teammates. He struggled against the desire, which was stronger than any other.
These thoughts and urges continued to plague him, still present on the day he left. Even as Sakura pleaded with him to stay, he was imagining all the wonderfully awful things he could do to her.
As he laid her unconscious form on the hard stone bench, he gave in.
He kissed her gently on the lips, savouring every sensation tied to the moment. When he pulled away, gazing at her peaceful form, the persistent voice quieted, satisfied for the moment.
Author's Notes: Yeah, yeah, it's pretty cliche and uncreative, but it was all I could think of for the prompt. xP Besides, I'm kinda happy with how it turned out, and I've always liked the idea of this kind fo scene.
Disclaimer: I do not own 'Naruto' or any of its characters.