"Well then, if you aren't shy..." Death Troopers didn't gossip, so nothing that happened between him and Astarion would reach outside ears.

He stood and took Astarion's hand. "I trust your judgement."

He was really doing this. He was about to have sex with an alien, with a mysterious past and motives, and both of them were looking to gain something out of it other than just pleasure. It wasn't how Thrawn usually did things, but Astarion was eager and willing, and Thrawn figured it would do him well to have a little coitus, rather than use his own hand for once.