"That specialist classification is based on me fucking people." I can already sort of hear this line being uttered.

If you look in the reflection you can see a bulge in her panties.

As such an amazing twist that'd be, I think it's just the outline of her bra.

if you follow the strap she's holding outside of the mirror you can see her panties don't quite match up, this may be a flaring from her movement, which would mean air caught could form this "bulge" you describe

Now wait a sec, we did never see her take off her pants... I guess that's up to her discretion.