The busty blonde

Jaune went to the end where Yang was and swung the watch in a manner similar to the way his uncle had.

"You're getting very sleepy," he said.

Yang rolled her eyes and smirked. "Really, Arc? The most generic thing you could think of?"

But even as she said it, her eyes followed the watch as it swung back and forth. Back and forth. Back and forth...

Eventually, her eyes fluttered and her head drooped, coming to rest on her tits. Her eyes closed, and she snored lightly.

"It worked!" Ruby giggled. "She's totally zonked out!"

Jaune smiled. He could give commands, but there was a certain...risk that came with it. Without further conditioning, Yang couldn't do anything too drastic or else her programming would break completely. So he had to figure out something she'd be comfortable with...

That said, considering she was around her sister and girlfriend, maybe he could push things slightly.