The pose in panel three is a direct parody of Asuka's voice actor, seen here from her twitter. It was a post celebrating the end of the 5th Cinderella Girls live concert, where she appeared to have included a photoshop-able version of herself making that pose, for some reason.
That's a pretty bold swimsuit you've got there, Asuka!!I'm a person who relies on narcissism, so it's natural to show off.Chest size is merely the whim of one's helical genes, is it not...?Looks like you're not so bold in this area, though, huh!!...Ku!!Sob...I accept my individuality and embrace who I am...Hmmm~
Is that true~?I haven't given up hope...!!There's still time to grow...!!Mirei-chan, let's go swim ♪OK!!