He is satisfied, eventually, that he knows how the angle translates into sensation for Dean. It seems his anatomy isn't so far off from the Chiss kind, which Thrawn finds deeply intriguing. Certainly Car'das was similar to a Chiss, but there were key differences -- strange, to find that there are key similarities, as well. Perhaps humans and Chiss are more closely related than he'd thought.

He takes the last vibrator between his fingers, knowing that this will hurt. Slicks it thoroughly with lubricant, so that at least that much will be made easier, and then he angles the two currently inside Dean to press up, at the most pleasurable angle -- and then he presses the third to Dean's entrance.

"Control your breath," Thrawn instructs.