To be honest, Nitrous had suspected that something was up with Doc for quite a while. He'd been acting shifty since February, but she'd managed to put it out of her mind. Having a short attention span helped with that. But earlier tonight, when he'd seen Kate, he'd looked like he'd swallowed something slimy. It was a look of guilt if she'd ever seen one, and it made her suspicious. Suspicious enough to do something a little morally dubious.
(Nitrous had a slightly better grip on morality than some of her siblings, but it still generally came down to "Is this a fun thing?")
"Sure, sweetie," Nitrous said, smiling. Doc never drank tea. Further proof of weirdness, right there. "You seem kinda tense, is anything wrong?"