He could name some times that Arthur didn't love his mouth and the sharp things he says to others. Including Arthur. Except there's nothing that makes him want to draw his mouth off the man over him. Nothing that made him want to stop.

So he strokes the base as his cock even as Eames' head bobs. Loving the way Arthur's cock stretches his mouth, the sensation of offering himself as he suckles at him, wanting to draw out the pleasure even if they don't have much time.

Later he would get his, but there's just a delight in sucking Arthur off, of servicing him in public. Kind of liking the idea that they might be caught like this and he loves it.