Cú Chulainn, your servant from an alternate history. A beast that'll follow any order you give him, as long as it pertains to battle. So of course he looked the other way when you decided to finally enact that gory revenge on the ones that'd wronged you, even going so far as to teach you a thing or two about how to effectively kill someone.

what he wasn't prepared for, however was your entirely erratic behaviour afterwards. Sure, most Master-Servant pairs can speak telepathically with a capable enough supply of mana, but Cú was being overloaded with your emotions. Rage, Guilt, Shame, Frustration, Resentment. You name it, it's being blasted into Cú's head and he's at his fucking breaking point.

Cú storms into the room, nearly breaking the door off it's hinges, rage only intensifying as he's hit with a wave of fear. You'd been sitting on the sofa, knees pressed into your chest. "Deal with your fucking issues!" Cú yells, grabbing a fistful of your hair and yanking your face up to look at his, "or I will."