Starting at this page, I took Red's first text bubble to mean "What do you think the reason is for this?", rather than, "Why do you have the impression that our situation is a date?"
Unlike you, I haven't the time to spare... or rather, I'm not that senseless to interrupt other people's dates.I'm only helping her out because Yellow was asked to do Blue a favour. Yellow's younger than me, after all....I did say it's like a date, but I didn't say it really is.Don't be stupid! Why do you think that Yellow and I are on a date?