Black and grey tattoo design symbolizing past love and twin flames, with two skeletons as lovers intertwined, representing the same soul in different bodies. The skeletons should appear as though they are merging cohesively, their bones blending seamlessly together. The design should convey a sense of deep, cosmic connection, as if their union transcends the physical world. Incorporate subtle ethereal elements like faint flames or stars, adding a mystical atmosphere. The shading and fine linework should highlight the intimacy and eternal bond between the two skeletons