Plague
After Mei Gui and I headed back to our dorms together, I told her to shower first and go to sleep, and that I had something to do still. She was curious and confused, but in the end obliged, since I was her master. I didn't want to 'force' her to do anything, but she probably sensed thanks to our telepathic connection that I didn't want her to pry.
Our link was kind of weird - we can see each other's emotions, but can't get a grasp on what exactly the other party is thinking. For example, earlier, Mei Gui could tell I was having some lewd thoughts, but couldn't say for sure what that was (rating Obsidia's body). Similarly, here, she can only tell I was reluctant to say anything, not what exactly I was going to do. This worked both ways, of course - I couldn't tell what exactly she was thinking, either, but I can tell if she's feeling happy or sad.