MY AU >:D It's kind of like good omens × SMG4

Both SMG4 and SMG3 are immortal. They have been through thousands of years and always managed to end up with each other

SMG4 is a well-known angel in heaven, he is the favourite, while SMG3 is a well-known demon in hell, he is very popular. SMG4 and SMG3 are complete opposite of one another but still manage to balance each other out

SMG3 hides his demon like features, like his horns, his tail, wings and demon markings, but he keeps his eyes red with slit pupils, and SMG4 hides his Angel features, like his Halo, Wings, Tail, and Angel markings, but he keeps his eyes an innocent blue with round pupils

One day, SMG3 and SMG4 are in SMG3's Cafè/home aka SMG3's Coffee and Bombs café, with his room being underground! SMG3 is sitting on the bed as he looks at his Angelic best friend/Rival, resting his head on his lap