The speaker offers a moonflower to someone they love, and the flower is also the speaker. Each stanza begins with the same gift, "i dedicate to you," like a repeated vow. At first the mood is dreamy and tender: pale petals, starry eyes, a fantasy forest where the speaker blooms only at night, only for this person.
Then the beauty turns painful. The flower spills from the speaker's lungs and creeps into the heart, so the love feels like something growing inside and slowly consuming the body. The speaker longs for someone who, it seems, will never love them back.
By the end, the tone is quiet and resigned. Dawn will come and the speaker will be gone, their beauty used up. The final line, "as i await my new saviour," is ambiguous. It might hint at hope for rescue or renewal, or simply at a lonely wait. The overall feeling is bittersweet: gentle, romantic, and sad.