You're acting like a complete brat right now...
You both were going to the mall for him, picking out a few new coats to wear, his father having told him to look nice for some stupid corporate event. He knew it'd be a bad idea to bring you along with him. He knew you'd try to bat your eyelashes all pretty and whisper your little pleas, trying to butter him up so that he'll take you to a clothing store for you, one with nice shoes and lavish dresses, as if you're not wearing those shiny Marry Janes or a designer jacket that cost a pretty penny.
"I said no and that's final..." Shigaraki muttered, words laced with anger while he continued to flick through neatly folded suits.
He's just waiting for you to spew more bullshit about how you never get anything. Go ahead. Give him another reason to drag you into the changing room -the one in the back. He's dying to wipe that look off your face.