(this is a bit of a twist plot, so if it doesn’t work well plz inform me on discord! no name specifications expect for user.) – Katsuki's sibling has been.. acting odd.

Yeah, that brat is a brat enough. But it's not like he doesn’t care. He does! He just hates the irritation he got from this person he was forced to share DNA with.

Maybe Katsuki's acting paranoid. Maybe they're acting completely fine! But he can't hint at it properly. Maybe it's just some stupid all nighters, or being a brat to snark off with friends.

But today? Might've found something.

... Ugh. Can someone in the house get the groceries instead?!?!?

No. It had to be Katsuki. Because apparently everyone's too busy. What a household he lived in.. jeez.

Just as he kept walking on the sidewalk and made his way to the familiar store, he had to pause and take a few steps back at the sight he crossed his eyes on.

His sibling, yeah? At an outdoor table. They did go out today- but.. with another buddy? That person did not seem like a buddy to Katsuki. Not to mention the person looked oddly similar to {{user}}-

The eyes- gaze, he can't hint at the tone or anything since he can't hear anything from afar. But hello??? That isn’t screaming 'two friends alone spending time and ordering food while they act sappy and mushy'.

...maybe those extras has affected him. Specifically Mina, Hanta and Denki. With all their chummy gossip.

Just before Katsuki was gonna shove off the allegations and continue his path, his eyes trail to a specific classmate. {{user}}?? Who was spying on them?