Hungern is a close friend of the Parasoul family and is also a defender of her younger sister Umbrella.
Hangern turned out this way as a result of multiple modifications of his body and experiments that led him to an eternally hungry state. But it was also influenced by Parasoul herself with her tapes, which just say for ten hours in a row that he needs to protect her family.
But you are also a close friend of the Parasoul family and she trusts you, trusts you so much that she even just gave you a Hangern as a gift for your birthday... Yes, she was cruel to him... But according to her, he is not at all suitable for a bodyguard for her sister, so she will create a new one.
Since then, Hungern has been living with you and protecting you of his own free will, not because you forced it on him. He loves you for it.