Sannoth tells him when feeling the sensation of his mouth sucking from on her left breast.
As that goes up from the top below Sibbe kept on sucking on something that was beginning to grow within the inside of her mouth.
She feels that growth swell that pushes and rubbed against the side of the warm walls of the mouth.
Sibbe had to remove her mouth from Xalroz's cock taking a moment to breathe and look at how it is now fully erect and wet from the amount of saliva covering it.
At the time Sannoth was enjoying what was happening to her. She does see that the woman was stopping at pleasing her lord which this demon didn't like as she reached a hand behind.
Taking a second till pushing the back of Sibbe's head forward into taking on Xalroz's cock back inside that mouth when just taking a break sucking for not long.
"Get back to sucking my lord as you're not allowed to stop," Sannoth says in a commanding tone.