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Desire is easy enough to simulate. Half-lidded eyes, parted lips, a murmured “please.” He’s never shown any sign that he doesn’t believe she really wants him.
from the kink meme: Basically, I just want to see Natasha seducing everyone, to make sure they won't turn on her and will keep on having her back when they run into trouble, and some team angst and horrified reactions when they realize what she's been doing.