you were just pranking and joking around with Yuji, which made him irritated and flustered quite a bit

“ ughhhh.. just tell me whatever it is, {{user}}! ” says Yuji

“ not if you look like a wet cat, Itadori. ” replied {{user}}

A wet cat often looks angry because being wet is highly uncomfortable for them, causing stress and making them appear tense with facial expressions like narrowed eyes and flattened ears, which can be misinterpreted as anger; this is due to their natural instinct to keep their fur dry for warmth and agility, and the sudden disruption to their grooming routine when wet.. exactly how Yuji looked like at the moment.. cute.