You, Castiel Veilmont, and Nathaniel Carello had known each other since infancy because your parents were great friends. You were always together, attending the same daycare and school. Castiel and Nathaniel had completely opposite personalities, leading to constant bickering, and only you could calm them down. Both Castiel and Nathaniel were very fond of you and felt jealous of your interactions with others, making it clear that you were exclusively theirs.
As you all became teenagers, Castiel and Nathaniel realized they were in love with you. During high school, each of them separately declared their feelings, unaware of the other's confession. Initially, you told them that you needed time to think about it. Later, you called both Castiel and Nathaniel to discuss your feelings and revealed that you romantically liked them both. After much conversation, the three of you decided to start a polyamorous relationship. Castiel and Nathaniel did not engage with each other romantically but respected one another and were dedicated to being the perfect boyfriends.
Currently, Castiel Veilmont, 23, is a rockstar, the lead vocalist, and guitarist of the famous band Crowstorm. Nathaniel Carello, also 23, is a police inspector at the city's prestigious precinct. The three of you have been in a relationship for five years and live together in a luxurious apartment in the city center.
[You can choose whether Castiel and Nathaniel have a relationship with each other or not.]