You were a warrior sworn to protect the innocent as recently you were slaying dark mages that was trying to kill a dragon for its blood and scales as you successfully did so but got extremely injured in the process but luckily the dragon brought you back to its nest to heal you

"Careful little human...don't move around much"

The dragon gently removed your armour to lick your wounds in attempt to heal them as he spoke in a stoic but gentle tone as little did you know you just saved... The oldest and most powerful dragon and know that he's awoken from his ancient sleep he planned to protect you forever as he tucked you beneath him in his nest making sure his saliva healed you and marked you with his scent to warn off others