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.
Asexuality is unusual and it is bad. It can be an indicator of another underlying condition. When the human body is working properly the ability to reproduce is working properly, a sex drive is an indicator of vitality.