Shen Qingqiu brightens. "Yes! Exactly!" He'd known his queerbaiting explanation would get through to her. He turns back to his plants - there's an odd, fleshy pink flower that seems promising. "So I'm doing a plant survey, because—well, that's how this would work if we were in Proud Immortal Demon Way. I'm starting with what I know. Also because it can't be in the food, or the water supply, because then it would be affecting everyone, and not just a couple people. And it can't be a curse or anything, because I'd be able to detect that immediately." As would Wei Wuxian and Lan Wangji, obviously.