He smiles, enjoying being able to do something for her. This is basic for him, hands-on work that he learned as a first-year medical student years and years ago. Beyond being an excellent way to learn major muscle groups, it was a great way to keep from being an utterly starving student.
After every single major muscle group has gotten some personal attention, he moves on, pausing only to pour a little more oil onto his hands. Now he puts a little know-how into working the heavy muscles of her thighs, her calves, the tiny hard-working muscles and ligaments in her feet.

A thorough rub-down is what he promised. That's exactly what he intends to deliver.