Since Justin met his master when he was ten years old, he was certain that he was the most important person in his life.
Don't underestimate children's intuition!
The man leaned down to hug him, so he was sure that the scent was a prop used by the master to seduce him and test his mind.
But why, he didn't withstand the test in the end, and the master still...
Whether it's a well-intentioned betrayal, life-saving protection, a pledge of loyalty, or a sweet confession, Justin has that boy in his heart all the time.
Regardless of his identity as master and servant, regardless of the world's rebuttal, and even regardless of his own beliefs, the demon god Charlemagne who once served as a spiritual pillar on the verge of life and death...
That monster-like boy... The immortal boy... My master...
Am I, Justin, really worthy of you?