Considering they were an expansion on what Lucifer himself did, Gabriel isn't too concerned about his reaction. It's not like they don't benefit him as well. So long as they make use of her often enough, she'll be able to focus on her other work just fine.

Gabriel's hips rock forwards more, pushing himself in deeper before coming and filling her mouth so she could swallow it all down, her body reacting positively to being used, even if her mind wasn't too happy at the moment.