Egg: This egg is surrounded by glow sticks.

Hatch: They love chewing on their glow ring. They have yellow glowing marks on their tail and glowing eyes, but are still kind of hard to see in the dark. The glowsticks are too big for them. 
Hatchling: They have gotten bigger and can fit the glow sticks a little better. Their tongue has began to glow because of all the glow sticks they ate.

Adult: They now fit the glow sticks. They love dancing and rave. They prefer to party at night though. They are a little easier to see in the dark now because of all the glow stick fluid in their body.

Story: A child was walking home after a birthday one day and tripped over something. The child looked back and noticed a small dark dragon, too dark to see almost. The kid took the dragon home and took care of them. The parents started to get angry though. They were sick of tripping over the dragon. The kid decided to cover the dragon in glow sticks. The dragon loved them. The kid grew up and noticed the dragon had become immune to the liquid inside the glow sticks. When they both moved out the dragon had an egg and decided to start a new tradition, covering the new egg in glow sticks, so no one would trip over it.