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This might not be true but the emphasis on the tea in the last few chapters maybe because Lucuons (spelling ik) parents were killed by poison liquid that was put in a drink. This cause Lucuon to be cautious about drinking from a servant. This can also lead to a furture betrayal as to indicate a storm related to the same incidence of the parents.
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I think someones gonna manipulate kyon to put something in the tea, because lucaon did drink his tea that time he was told zo make it for him so their probably gonna use kyon as their scapesgoat for the plan. Also think the blonde haired servant has something to do with it since he's been acting anxious around the others for a while now and unnecessarily killed that dude who broke in so he defintely has something to hide. (Also as far as I can remember he was the one who suggested to make tea for lucaon and that kyon serves it so..... Hint?)
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I think the same like Kyon is gonna put that solution that turns vampires on Lucaon drink but like you know how Ryan was mentioning that the only cure for the poison is if the one that gaves it out repents
Theres must be a reason why the author put that info out there so maybe Kyon will be manipulated to do it but when he realizes what he did or like Lucaon is about to become a Zero again hell repent and Luacon will be cured or something like that
Ok, this might be a far stretch but why so much emphasis on the tea that the two main characters drink this is like the second or third time im seeing the focal point on the tea. I find it very suspicious