I Shouldn't Cross This Boundary

She keeps the camera rolling. Notes everything. Usually her hands stay busy, but this test demands precision, so she kicks off her heels and uses her toes instead. The second his clothes hit the floor, she knows this one’s different. The way he twitches under her foot tells her the rules are already slipping. She edges him slow, deliberate, until his breathing turns ragged and the line between experiment and hunger disappears. His release hits hot across her sole, and she watches it spread, breathing hard, knowing she just crossed it anyway.