Dragon friendship

Background: A dark cave where lava and flames glow in the distance. In the foreground: A giant black dragon who appears fearsome, large and dark, but his expression is soft and loving. His eyes do not glow, but are of a bright blue colour and have pupils like a cat. A fearless boy, about 5 yeards old, with short light blond hair and wearing medieval clothes, is standing in front of the dragon, looking him directly in the eyes. The head of the dragon is near the boy. The dragon holds open a small part of his chest with one claw to reveal a very tiny whole, where his heart used to be. With the other claw, he hands over his heart pulsating with rainbow colours to the little boy.