In just three short lines, the speaker makes a surprising wish: they want their own defenses to fall. The "walls" stand for the emotional guard a person puts up to avoid being hurt, and the speaker asks for love to break through them. The word "invasion" is striking, since it usually suggests violence and conquest. Here it describes something the speaker actually welcomes, though the word hints that love can feel overwhelming, even a little frightening, as it arrives.
The last line, "Covered by ashes," changes the tone. Ashes are what is left after fire or destruction, so the line suggests that giving in to love may leave something behind in ruins. It could mean the old, protected self is gone, or that the speaker sees loss as part of the price. The mood is a mix of longing and surrender, with a quiet shadow over it. The speaker seems ready to be open, but not without awareness of what that openness might cost.