It was considerate. His previous lover was not fond of being held down at all so Hawke asked. He didn't want to ruin this little bit of happiness he found with Killian.
"What about you?" he asked as he cooled his whole hand and left it resting against Killian's neck so that he could enjoy the chill to its fullest. They had become quite warm from all the physical activity. "What do you enjoy?"
Trust went both ways, of course. Hawke was willing to indulge Killian's desires as well as his own. That was the fun of a new lover.