Miles managed to close his eyes and let out a soft sigh as her fingers ran over his closely cropped scalp. "Good," he murmured in reply, letting his own muscles stretch against the sand. He scrabbled around in the robes beneath them, finding his wand and casting a cushioning charm, a warming charm and a sun protection charm on them.
When she said she was very tired, he opened his eyes and gave her a concerned look. "Did I wear you out?" he asked, worried that he'd made her overdo it. His finger played through her hair, not caring if they would be covered in sand - they could always cast a spell to get rid of it later. The combination of the sand and the salty water would probably do her skin a world of good, and help her to heal.
He answered her question with a yawn, looking sheepish but not making any other attempt to move at all. "Perhaps just a little one."