As the name implies, a flat chest has little to no breast development at all, just an even surface for the entirety of the chest. A looser definition can include little bumps or buds for the breast area.
The following tags are aliased to this tag: tsurupeta, titty_buds, pettanko, flat_chested, and flatchest (learn more).
The following tags implicate this tag: flat_chest_grab (learn more).
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