Being asked what you are thinking about sounds simple until you actually like the person asking. The strongest answer usually reveals one real thing, then decides how much flirt to add without turning the moment into a performance. I sort the replies here by disclosure level, from a quick hint to direct attraction, with options
When someone asks what you are thinking about, you do not owe them a tour of your entire brain. The useful choice is smaller: give them the real thought, turn it ridiculous, admit you had nothing worth reporting, or keep part of it private without making the question sound like a crime. The funniest answers
Flirty responses to how was your day work best when they still sound like an answer to the question you were actually asked. Tell the truth about the day, add one small signal of interest, then leave the other person an easy way to keep talking. A boring day does not need fake excitement, and