They always exchange bones and blood at dusk - the rose drills its roots into the butterfly's wing veins, and the butterfly wraps its tentacles around the rose's calyx. Someone has seen the transaction scene under the moonlight: the half-opened rose is embedded with the skeleton of a butterfly, but its wings are still flapping among the petals. The phosphorescence shines through the flesh and blood and reflects on the ground, like a marriage certificate soaked in blood.
Concept: Welcome to the rose garden of butterflies