Tony Stark was a night owl. More accurately he was a workshop owl who didn't keep track of the time when he was elbows deep in tech. That's how he ended up stretching into the kitchen at 1am to grab something to eat. Second dinner. He waved absently to Natasha as she lounged on the couch watching a movie Tony couldn't quite place.
Between rubbing the exhaustion off his face and shoving leftovers in his mouth he noticed Natasha was now sitting up stiffly. Tony straightened up, anxious she had heard an intruder or that there was some other danger approaching. Instead, Natasha scrambled for the remote and turned off the TV stalking out of the living room without so much as a 'Night, Stark.'
The engineer glared at the puzzle in front of him. The television had been the cause of her negative reaction. Had she been watching something with an X-rated scene without knowing it? And the idea of watching it with Tony present had bothered her? No, she wouldn't have had such a visceral reaction to that. Embarrassment wasn't really Black Widow's thing.
Plate empty and curiosity skyrocketing, Tony couldn't help but turn the TV back on to see what she had been watching. Natalie Portman's terrified black and white face greeted him. The info panel at the bottom proclaimed the movie to be Black Swan. Tony recognized it as some surreal movie about a ballet dancer. He didn't need to think too hard to remember the snippets of stories of Natasha Romanoff's time in the red room and how the creepy dancing theme would upset her to this extent.
With the help of F.R.I.D.A.Y., Tony spent the next fifteen minutes blocking access to movies involving ballet as a main theme. He left behind the Nutcracker and movies about dancing street gangs. But blocked those such as Black Swan, The Red Shoes, The Company, and something called Billy Elliot.
Nodding to himself in accomplishment at the now black screen of the TV, Tony decided to call it a night.