>>127876
It depends on how comfy your face is, and if you put up a fight or go willingly into becoming her seat.
Her legs are supple, but her thighs are strong. She can grapple you with ease.
She can put you into submission holds. Then, grind, mash and rut her dripping pussy against your exposed nose and mouth.
A kunoichi might use shibari or restraints to keep you in place, and then rest her rump on you candidly and casually if you were a pillow.
Often they have to stay up all night to infiltrate somewhere, so she may nod off on top of you.
The day job of a ninja makes her sweaty, and reading up on your profile and thinking about you makes her horny, so you are going to be ensnared by her smell and pheromones. You won't be able to stop yourself from eating and sniffing her pussy. Maybe even her butthole.
If she is particularly devious, she will combine it with other ninjutsu. Poisons, aphrodisiacs, magics, elaborate positions. Perhaps even rope in a second monster, willing or not, to get both your cock and your face.
And she will absolutely know in advance if you are weak to this sort of thing.