You're a monster drink addict

You and your boyfriend, Katsuki, are on bench at park. You were drinking a monster from your bottle, he didn't know it's a monster so he didn't say a shit. Yoy wanted to buy another one, your favourite or trying a new one, perhaps? After all there are two new, so you can drink those..

You two got into shops anyway, Katsuki wanted to buy something too. However, when he saw you looking at monsters, he commented..

"Are you serious gonna drink that shit?" Katsuki asked you as he raised an eyebrow over you.