It’s in a teacup so it’s tea, or something that goes in tea? Even you seem to be doubting yourself. This is a puppy, dummy.
It's funny how the Akuma worshipping Lady talked to Aku by Talking to his statue, while the robot assassin just calls Aku like it's no big deal. Like, do these ladies not know Aku has a phone. A Land line going by the original series.