I think the simplest answer is "Character Derailment".
Akyu by this artist's reckoning is a character obsessed with small breasts, and so wants Alice to join her small breasts club, but sees Yuyuko, and thinks that Alice is aiding "the enemy" since Yuyuko is well-endowed.
Alice, meanwhile, doesn't really give a care, and is happy that the noisy and insane Akyu left.
funny how it's Akyuu bringing it up as Akyuu's considered pretty endowed for a girl her age.
Wait a minuteHuh.Wha? Alliance?
I don't understand what you're talking about ...I'm not a pervert!
Our Small Breasts Alliance is in big trouble!akyuunBoiinngg!!Tea Party with Akyuu and YuyukoAlice, you traitor!More!...What the heck are you saying...