Have sex with her on the floor.

"We should have sex while you look."
"Good idea." She agrees excitedly without looking up from the rug. You kneel behind her and pull your dick out, rubbing it against her wet pussy before sliding it in. She moans but continues to do her job, scanning the rug for something shiny. You thrust into her again and again making her job difficult but that doesn't harm her enjoyment. She moans loudly as you reach around and feel her large breasts through the thin t-shirt. Soon you're pounding her hard and slapping her ass. She turns around while moaning and says "I found some broken glass" and you feel yourself ready to cum.