Responses
Someone can be embarrassed and blush when your siblings takes care of you. That only means you appreciate being taken cared off. Doesn't entirely mean anything romantically.
But yeah, probably the author tried to hint that maybe deep deeply, like mariana trench kind of deep, A really does have a tiny bit of romantic feelings for his brother.
Y'all saying it's off putting since A sees his bro as his brother yet he's a panicked blushing mess 24/7 around him