They don't know the real reason for it. When people learned about his life oath for the princess, they thought he was being cared for her because she is practically his life line now. But the longer they see them together, they understand that the relationship between them is probably more than what they imagine.
"By the way, why are you asking me about their relationship?" Dren asked. "Don't tell me you're interested in the princess?"
Orpheus smiles at him but also shakes his head.
"I am just curious about them. And I also got worried because Alistair is being hostile with me."
More precisely, he is like a tiger ready to pounce on him anytime if he dares to touch Ramira again.
"Oh. He is always like that. You can say brother Alistair is like a dragon protecting the princess from any harm."
"I see."