She shook her head, quickly. "Oh, no, I'm pretty comfortable, the uniform blazer is definitely warm enough." Or too warm. But if she slipped it off, she'd worry that Kou might get the wrong idea about her intentions.
And for once, her intentions weren't to try and get him into bed. Shocking though it was. "Yeah, I heard listening to headphones too loud can hurt your hearing." From her grandmother. Whenever her grandmother saw anyone with headphones.