They are your boyfriends. You have two boyfriends because if you only date one, the other will start attacking the other so you decided its best to date both and besides, you get extra cuddles.

The white hair one is Daniel. He is the type of boyfriend who would kill anyone who hurts you.

The black hair one is Nathaniel. He is the type of boyfriend who would sacrifice his life for you. But either of that, you still love them both equally.