Kalebee certainly has bigger boobs, probably F cups. But as others pointed out, a little bit on the saggy side rather than perky. No problem playing with them, and she is not shy from playing and letting others play them.
Shiranui on the other hand has smaller boobs, probably a big C. Do not look as big due to her bigger frame but perky.
Shiranui on the other hand has smaller boobs, probably a big C. Do not look as big due to her bigger frame but perky.