Dave Bonta's "Night air" is only two short lines, but it packs in a whole small scene. The speaker has bought a rose for his wife, and somehow the night air is present "in the rose": the coolness, the dark, the scent that seems to cling to the petals. Then the poem turns suddenly to "her free mouth," and the flower and the woman blur together.
The word "free" is the interesting one. It could suggest a mouth that speaks openly, laughs easily, or kisses without holding back. It might also hint at how the open rose resembles lips. The poem doesn't say which, and that openness is part of its charm.
The speaker seems affectionate and a little awestruck, still noticing his wife after what we assume is a long acquaintance. The mood is quiet, intimate, and sensual, with the hush of evening around it. Because the poem stops so abruptly, the feeling lingers like a breath.