Crais is rolling his eyes because he is overcome with lust. Obviously. Who wouldn't be when confronted with Bashir?

"I feel that I should argue the point, and yet --" Well, he's getting his shirt off and his pants undone while still trying to keep as much contact as possible. It's a true statement, but he feels obliged to debate the point.

"Next time, you should let me use the silicon one. Same feeling of strangeness, but you can move a little easier."