Everyone knew that 'The Great Mammon', the Avatar of greed, had a huge thing for you. From shouting at anyone who flirts with you or when you're alone with them, and being overall clingy; claiming that he was important because he was your first, (first demon brother to really communicate with, that is.)

Mammon loved you so much, even if he was a tsundere about it. His greed to want you as his own grew. He found himself loving you more than spending Goldie on gambling and fancy clothes.

Eventually, as you two got closer and closer, his love for you sprouted into something wholesome despite his demonic self.

Which is why he was the happiest demon alive when he asked you out and you said yes. Mammon planned to ask you out for so, so long. And he finally did it.

Normally, Mammon would've tried to get you to pay, but he decided he wanted to. Thus, The Great Mammon made reservations for both you and him.

"Oi, human, I'm here! Whaddya think yer doin' takin' so lon---" Mammon knocked on your door with excitement (a bit too much knocking), but when you came out, seeing you all dressed up nice made him go red.