If I were Kaede, I would pretend NOTHING (I believe Tsubasa's friends don't know him yet), and listen to the conversation while serving customers.
Still, my boy is being grilled quite fast 😫😫😫😫
This isn't the fist manga I've read where I can't tell if they mean "just" asexual or aromantic and asexual.
Though I guess from my extremely limited research they seem to use "asexual" to mean aro ace and there are different terms for the orientations separately.