I saw a video on here once but I can't find it now. It was a video of a girl with short black or brown hair and glasses flexing her legs on a couch. I believe the couch was red or dark colored.
That's hilariously vague, no one's going to bother with that description. You didn't even mention her skin color, what she was wearing, whether she was a giant bodybuilder or a small figure model, what type of leg flex she was doing (calves, quads, hamstrings), etc.
[Locking this thread, as it's immensely useless and OP doesn't seem inclined to add any more info]