That gets her to glance up in surprise, wetting her lips unconsciously. "You noticed only now?" she asks after a beat, a small smile of amusement curving at her mouth.

Okay, to be fair, she covers them up with foundation a lot of times. Maybe he really hasn't seen them before; it's not like they've seen one another so often outside of missions and during those not much but her face is visible when they're done with the action.