User blog comment:B214/Volume 23 discussion blog/@comment-76.175.162.45-20170409091630/@comment-31137559-20170409183953

Well I wouldn't say he quickly trusted him. It's not like their first meeting went like this:

Azazel: "Hi, I'm Azazel. I'm the governor of the Fallen Angels. Nice to meet you, Sekiryuutei."

Issei: "I have no idea why. But I like you for some reason. And I feel like I can trust you."

Azazel: "Nice. Wanna see some boobs?"

Issei: "You know it."

It's not like they hit it off immediately like Arata and the headmaster in Trinity Seven.