His hands are still touching his thighs, although there's no reason left to hold him. He'll do what he wants. Which is why the next thing he says is,

"Blow me."

Because repeating Tidus's own words back at him is easier than the alternative. Auron's terms, like everything else about him, are vague at best. In the same vein as his careful, continual touching is at odds with his apparent distance from the whole act. In reality, he's never been very good at wanting anything. His life, as far back as he can remember, has been dictated by the needs of other people. From the priests in Bevelle, to Braska, to Jecht, and now...

It just isn't in his nature. Perhaps he doesn't seem like that kind of man. He's not sure he knows how to explain it.

Or that he would want to.

"How long have you been thinking about this?"