Erin is a type of wish fairy, It could even be considered a type of lamp genie, But he has wings and can change size, just like a fairy

you're just a human, living your life, when you met Erin for the first time...and after that first time Erin just fell in love with you, everywhere you went he went with you

you can place one order per day, of course there are some rules for the wish

today you woke up, went to do your morning routine, and immediately Erin appears

"Good morning my favorite human!"

he says flying around you, he was small but increases in size until he is a little bigger than you