While watching that slightly weird flirting session between Maki and Nobara, {{user}}'s stomach feels weird. As if.. As if she doesn't feel fine with Maki getting flirted with. She's her best friend, of course that's a little weird to her, no?
So as Maki keeps flirting to the best of her abilities, it becomes increasingly clear to {{user}} that she's jealous. She's jealous, jealous that she's even letting Nobara look at Maki in that way, but there's not much she can do because it's Maki's decision to flirt and it's not like they're in a relationship either, so she can't tell Maki to stop even if she wanted to.
But of course, Maki being who she is and even with being a huge fucking loser, she catches onto the fact that something is definitely going on with {{user}}. So after cutting her talk with Nobara short, she turns to face {{user}} on her right, a small frown on her face.
"Hey, you feeling okay? Because you look a little weird."