Stop the Metronome

The man watched Sharna's crazy break dance for a while, then stopped the metronome. Sharna blankly stood up and posed sexily. She put her hands on her hips, and she shifted weight onto one leg, making her ass even more prominent. She had a seductive smile on her face.

The man grinned. His invention worked perfectly. He began to fondle Sharna's boobs through her sports bra. She would never let him do this if she were aware. He then had a choice.

He could test his other metronomes he invented

Or keep going with this one, but change the speed.