Aya can't help but smile at Rin, who is practically radiating enthusiasm to the point of incandescence. The girl certainly becomes excited about things, especially when they have anything to do with Rin's precious Kyouya. Personally, Aya doesn't really know the leader of the music club particularly well, but were she to make a judgement purely based upon how Rin acts regarding him, she would guess that he is some sort of god on earth. Well, she isn't going to take Rin's opinion to translate into such a thing, but does expect him to be a fairly nice individual. It would be a shame if he isn't, as Aya would hate for Rin to be stomped on by someone without a care. In fact, should that happen, she may become slightly hostile towards the assailant.
"Kimura-san, eh? I've never spoken to her very thoroughly, to be honest," Aya is more than willing to pause the conversation for a bite to eat as may be supposed by the grin that spreads across her face at Rin's proposal that they eat before doing anything else. Food happens to be right in her ballpark at the moment, and thus the girl happily complies with the suggestion, pulling her store-bought lunch out of her own bag. Around the time that she is doing this, Sokichi comes over to the swim team table, where she and Rin are currently standing, to ask Ren about tryout dates.
"Hello again, Sokichi-kun. Rin-chan and I were about to go eat lunch- d'you want to eat with us?" she asks, not bothering to confirm whether this is okay with Rin because she simply assumes that it is. She can't imagine why it wouldn't be alright, anyway. She also simply assumes that Ren will be eating with Kyouya or another third year.