Cremation is the subject, but the poem is really about what a body, and a love, leaves behind. The speaker lists what is left in short, blunt lines: ashes, dust, bone fragments. Then comes a surprise. Next to the bones sit "fragments of lust," so the physical remains and the desire that once filled the body are placed side by side, as if both were burned down to the same grey powder.
The shift from "Ours" to "Yours" is quiet but sharp. The speaker seems to move from shared experience to a single person's loss or ownership, though the poem never says exactly who is speaking or who has died. That gap is part of its effect. We feel a relationship, and perhaps a death, without being given the story.
The mood is bare and aching. The single words and full stops feel like breaths between sobs, or like handfuls of ash falling. The final question, "Is it ever enough?", stays unanswered. It could ask whether the love was enough, whether the time together was, or whether anything can ever make up for what is gone.