"It's not a waste if I'm healing you." Emma didn't think healing anyone was a waste, but even less so when it was Jefferson, or Ruby or Killian. She didn't mind using all of her magic to heal if that was what it took. But she could take the teasing at least, but the point was just what they considered a waste.
Martyrdom or not, Emma's drive to constantly help didn't escape her. She knew she'd run herself into the ground here if she didn't stop once in a while, especially with the trauma that came with each crisis here.
"Massage would be doable." She probably wasn't terrible at it, and she could still work a little magic in if she was careful about it -Jefferson was probably more aware of her magic than most. She could at least help him out with relaxing. "Not everything needs to be violent you know." Although a lot of them time, Emma was decidedly violent and Jefferson had first hand knowledge of that.