Lyric discussion by KickinFamily 

Cover art for The Lady Wore Black lyrics by Queensrÿche

This is almost certainly about a vampire. The black, the night, the eternal life, the warning that he should leave, him sharing her sentence... Yeah, vampire :)

A vampire who wore black, of course :)

@KickinFamily Could very well be, because Queensryche have said around this time, that they were into Anne Rice books. Interesting take.