Okay so may I request a scenario where Shiro and his s/o are waiting alone for Sendak to wake up-or do anything-and then she tries to calm him down and he accidentally hurts her or something and thinks he doesn't deserve her or anyone???
(This is when Shiro is ‘interrogating’ Sendak and smashes the glass.)
Shiro’s fists were still clenched, shoulders shaking, when you rushed through the entrance was to where he sat. You called his name twice, worrying knotting in the pit if your stomach. Shiro, however, couldn’t hear you. He glanced to where you stood, and instead of seeing your sweet, concerned face, he saw Sendak leering at him. The second Sendak moved towards Shiro and put a hand on the paladin’s shoulder, whispering terrible things into his ear. The Galra soldier whispered about what his soldiers did to people who looked like you, and Shiro’s blood boiled. No. He wouldn’t let that monster touch you. Shiro’s robotic arm shot out, grabbing Sendak’s throat, fingers against the larger man’s wind pipe. Sendak managed to choke out a feeble ‘Stop’, before the purple features soon melted away into your own. Shiro’s eyes widened and he immediately retracted his hand, wrapping you in his arms whispering apology, after apology. You tried to speak in a hoarse voice that it was okay, but the sous of your breathless voice felt like a punch in the gut to Shiro. He had hurt you. You. One of the only people who he’d ever loved more than life itself. He had wrapped his fingers around your throat in an attempt to kill you. End your life. Extinguish you. No, not you. Sendak. Shiro curses himself, but not before think 'I’m a monster,’. Those words echoed in his mind. Bouncing around his skull, picking up the memories of the times that he hugged you too fiercely, or kissed you too passionately, or watched you cry while doing nothing. Sendak was right, he was a monster.