The look Kajiko shot back at Gendou was actually one more of smugness than anything else. She was quite happy with herself for having thought of giving him "that" tea in order to get her point across, and it seemed like it had worked given his referring to her as "Yamaguchi-san" finally.
"I do know exactly what I need to do to get any events OKed by the school, Retsu. I've been the Tea Club President for longer than you've been Student Council President you know," she said, then, as if to spite Gendou some more, she took a sip of her own tea, which was the same as that she'd given him. Unbeknownst to him, however, she'd slipped some sugar into hers while he was distracted with coughing and Masami's arrival.
"And yes, Sakuraba, I did give him that tea. For some reason I really just felt like it. Do you want some too?"