Fortunately, Sans thinks to check the center of the garden first, so he's not looking for too long. He hears her humming before he sees her, but still lets out a sigh of relief as she comes into view. His shoulders visibly slump with it.

"hey, uh...hey, grune." He offers her a wave to try and get her attention, trying not to actively look as anxious as he currently feels. "can i borrow you for a bit?"