Lucifer's little brother has always been just as capable of being as vicious as any other archangel. She's just never had occasion to see it when she was human or have it unleashed at her before now as a demon.

Lucifer sheds his clothes as he takes his place on the bed behind her, his brother taking his own place in front of her. Pressing his way into her gives Gabriel permission to begin pushing his way into her mouth, making her need to accommodate both of them. There's only the barest of pauses before they thrust into her in unison, both using her at once.