Vexen probably didn't know, but Demyx often played notes in stream of consciousness, which sounded unique to how he felt at the time without properly composing. He could do that too, of course, but music was one way his heart could express itself.

He shook his head at the sandwich, his fingers not leaving where they were. "Oh. Uh. I'm fine. Not dead. All good." Demyx said with a bit of a smile.