"Hohoho, it is a pleasure to meet Miss Lucy again."
The laziness of the old man laughed as he laughed heartily and followed both Lucy and Arthur into the villa. His focus was on Arthur, who was also wary and curious about Sloth.
His copy repeatedly told him that Sloth is extremely strong and one of the oldest beings in the omniverse. Though, it's a mystery why he's working for the System when he belongs to the Heaven and Hell Universe and Arthur wasn't going to pry on that. Seeing as how Lucy treated him with respect, it shows how strong he is.
He didn't seem to carry any hostile or malicious intentions so Arthur didn't act arrogantly or cold toward this elder.
"This place is surely more comfortable than the rest. Good for you good for you!"
Snory praised the luxurious and spacious villa as he sat on the sofa and made himself comfortable. Although he merely glanced at the furniture and such, that doesn't mean he didn't get to sense the whole place with cultivation like his.