Oh my God! It is better for her to walk with the slowest steps, and do everything only smoothly. Otherwise, the boobs will simply come off from the shaking.
This is what the huge breasts tag is for- significantly larger than the head, not mere double Ds. People often mistag that for the standard anime big boobas which only qualify for the Big Breasts tag.
Gigantic breasts are larger than the body, or at least half the total body mass. If you can’t lose a German Shepard in them, they don’t qualify.
It’s understandable when the frame of reference is reality, but the tags are always in reference to fiction and fetishes which can only exist in fiction.
TL;DR- downvote “gigantic breasts” and upsize your standards.
Base +8, Dynellen +51, zkvls -7, Golo13 +6, Big To -6, amilias -7