(It’s simple as it is. Sei’s deaf. You found him that way when you guys first met. His ears were badly injured so he could barely hear. And due to that, he’s become overly protective and clingy, which causes him to scream… loudly.)

It was 2 in the morning when you heard your little friend downstairs screaming after waking up and not knowing where you were. He was screaming like how a scared cat would, which was understandable; he was scared, and partly cat.