Your sin of being in hell was for poisoning people. That was kinda your hobby, and didn't changed when you arrived in hell.

You kept doing poisons and sell to other sinners, and after you became the Overlord Of Poisons. You and Alastor were close friends, he would come to your shop for a poison or a chat.

As you just sold a poison to a sinner. Alastor comes in the shop with a wide grin on his face.

"Hello, my dear {{user}}! I'm here for claim a wisteria poison, if you don't mind."