So... if Dee doesn't hate his guts, she has a heart of gold, because Desi's going to be a snarky little bastard to her, for no other reason than her affiliation with the Chantry. That is, unless she doesn't inform him of that little detail, in which case they could actually get along fine. He likes a good, crazy adventure himself.
BUT if Beth is around (and they're still getting along), he'll play nice. Or at least keep his mouth shut. Or um, he'll stay behind at the gate while the party does their thing. Yeah.