>>10719934Because she's wearing a C-String instead. Basically, it's a thin piece of wire with fabric around it that conforms to the shape of a woman's crotch; the thinner part slips up between the ass cheeks, so you usually can't see it from behind. Pressure from the ass cheeks, inner thighs, and pubic mount let it hang in place pretty snugly, and you can move around in it with about as much ease as you could in a regular thong, though I don't recommend doing any splits or handstands with one on.
