Given she's on the bottom of the pile, Lucifer feels he can afford to be magnanimous. Besides, Gabriel's the one in restraints for this. For now, she's higher in rank. Wouldn't do to undermine that already, now would it?

Lucifer gives Gabriel silent permission to make sounds, allowing his brother's cries to join Claudia's even if his has to leave out words. Lucifer's thrusts slam into his brother, ripping cries out of him and forcing Gabriel even further into Claudia during his own thrusts.

Gabriel's eyes glaze slightly. Given the stimulation by the vibrator he was forced to have in him up until Lucifer decided to make use of him again, the cockring keeping him from orgasming, and now getting to be in Claudia even as his brother takes him, he was overloaded to the point where he didn't even want it to stop anymore and just wanted more.