>>509273804
>What's that extra curve under the left boob
What do you mean, her underboob? It's basically caused by a somewhat small brassiere, or in this case bikini top, relative to her chest. Her boob is restrained somewhat by her top, and as a result there's a rather accentuated area of boobage underneath it which is called an underboob.

Man, I love boobs. I love decolletage too. We've got to get melons for MAGA legislation passed to protect American titties. No tax on tits, ban reductions, all that.