rising flames, rising fumes, aroma
焄 centers on the visible and sensory result of fire: rising flames, smoke, or fumes, and by extension the aroma that rises with them.
焄 combines 君 (which likely contributes the sound) with 灬 (fire), suggesting the idea of something rising from fire, such as flames or fumes.
A lord (君) stands over a fire (灬), and from the fire rise flames and aromatic fumes, filling the air with a strong scent.
For クン, imagine a coon (a raccoon) sniffing the rising aroma from the fire: coon -> クン, and the scent rises like the flames.