2 girls who's centre of mass is dangerously high and is almost outside of their body... My mom had tits like them though she is 5'6'' (so comparatively, so my moms would be larger ) and she got breast reduction surgery twice because of back pain, sleeping problems, titty sweat problems first was at 17, next at 22 and she still has g-cup at 60.
I prefer c-cups, as they are pretty much as big as you can go before floppy saggy tits become a problem