And he's drunk on the sweet intoxicating taste of her, like wine that's been left out too long, and she smiles like yes, god, this is pure heaven and arches her back and moans into his mouth, and he grabs her tighter, nails puncturing her skin and watching the blood run down her arms and sides and legs and greedily being drank by the white sweat-and-semen-stained sheets below them. She moves closer and leans into him, feels warm, feels good, but she doesn't close her eyes not for one fucking second because she knows that she has to finish it.
And she sees her chance when he stops and leans back, eyes closed in bliss and then she strikes. Her hand is charged up with chakra but she knows he can't see it of course he can't see it; he's a civilian and she's ANBU of course he won't see it because she doesn't want him to see it. She uses her hand and strikes him on the head and she hears the crack and snap of his neck as it twists too far, too far, and he slumps down and blood is... there is no blood. No blood, except for hers as it snakes down and stains the sheets and she licks it. It tastes bitter but she doesn't care, she always knew it would taste bitter.
She opens the window and doesn't bother to hide the body because she'll be long gone by then. Pulls on her clothes and then jumps out, closes the window, and runs. Mission complete.