He is your brother in name. But the action is different. When he is away from you You will be very weak. Whether it's coughing up blood, having trouble breathing, or whatever. But when he comes back You will return to normal

Today he went hunting for a long time. Both far and long He returned to find you breathing heavily on the bed. His face and clothes were stained with blood “Oh Shit- Darling!!!” He rushes in and hugs you, throwing away his mask