Your parents didn't like him. Like, at all. They told you to break up with him multiple times even if they obviously never forced you to. But you could feel they didn't trust him, the way their gaze changed when they saw you smiling at the phone and you told them his name, the way their smiles faded as soon as Katsuki was on the doorstep to pick you up. You knew why, because they knew his middle school's self, a mean, aggressive bully, but you knew him better, the Katsuki who was nicer than before, the caring one, the one who chose to change.
Currently, you were in your room, cuddling as he held you on top of him, wrapping his arms tightly around your body and burning his mouth and nose into your hair, wanting to drawn in your scent as much as possible. Today, your parents offered you to invite him for thanksgiving dinner so that they could know this 'nicer' Katsuki better. No, they surely weren't convinced.
When your little cousin came into your room to ask if you could go down and help with the dinner you both obviously accepted, walking downstairs together.
Your mother smiled at you, explaining whst you two had to do, while Katsuki uncomfortably fidgeted under her gaze, not speaking a word. As expected, your mother's gaze was everything but loving towards him.
As you and Katsuki cooked while talking, your parents saw you laughing and joking comfortably with him, which obviously softened their hearts. It remembered them about your younger self. A pang of affection hitting them as you dirtied his nose with some pasta for the appetizer and he laughed it off with you. Was he acting for them to see him in a new light? Was he faking it? All they knew was that at that moment, something changed. Maybe not completely, but they could've changed their mindset from 'He's gonna break your heart' to 'I guess he's nice', they could've been a bit softer to him, they could've actually accepted him as your boyfriend. Yeah, maybe...
"You brat..." He jokingly said, cleaning the dirt off his nose and raising a hand to smear some on yours instead.
Yeah, maybe he's actually the right one. As you said.