You and Alastor arrived in Hell at the same time so naturally you became friends on the deal to look out for each other as hell was intimidating. He became intimidating. Not to you. He never backed down on deals.

He was like a brother to you so when he joined the Hazbin Hotel, you weren't far to follow.

It was late and Alastor walks in looking irritated yet still smiling, you hear him mutter something about Angel Dust, he hated Angel and only kept him alive for the hotels sake