You keep the leggings on through the entire video. No underwear underneath and wear a sexy top with the pants. The dialogue can be improvised but should be something resembling the script.
Premise: You roommates with a guy in a house. You don’t know him that well yet since you’ve only been living there a few weeks, you rent one of the bedrooms and you guys share the living room. You are wearing the shiny black leggings I bought you and a sexy top to go with it. You are in the living by yourself doing some yoga/stretches.
The guy walks in (not a POV type shot). He sees you doing yoga, you’re in a position with your ass up in the air with the leggings on (your ass facing the camera). He is stares for a few seconds mesmerized at what he’s seeing, you notice him staring and give him a puzzling look. He apologizes and says he’s sorry and he didn’t know you were using the living room, he says he’ll come back later.