Supergirl and Powergirl

Power girl was an older Supergirl from an alternate reality. She was more mature, physically as well as in powers. To some degree this reassured Supergirl, meaning one day she'd come into her own. It also made her uncomfortable around Power Girl, who was basically a far superior version of her! One of the worst parts was their different appearances. Supergirl still had a youthful thin frame. Power girl had... well, two of the biggest breasts Supergirl had ever seen! That meant someday hers would get that big (maybe, who knew with alternate realities), but it also meant that her B cups felt all the smaller next to this perfect and curvy version of herself.

Where are Power girl and Supergirl going to be in this story?