Cube heart Aphrodite to Hades. Cube with a heart. Goddess of Love connected to Pluto. Love in addition to Pluto making up a cube. Venus intersected by God of the Underworld.
The bond between heart plus Venus, without Pluto. The square as a symbol of passionate love, associated with Venus and Pluto. Two entities merged in a square: love and Aphrodite to Hades.