It's not fear in that moment that keeps Robert from arching up, from reacting aggressively in his desire. It's caring about her too much to do anything that could either hurt her, or cause her to stop. That she is giving him this pleasure at all leaves him stunned and thankful.

Not that he's entirely thinking those things.

Instead he groans, eyes fluttering open as he shifts enough to raise his head. Needing to look at her, to see this beautiful, wonderful woman. Gasping at flash of pain from her nails, something that leaves him wondrous at the sensation, that he finds such pleasure in it.

His hand shakes as he reaches up to stroke his fingers through her hair, curling the strands over his fingers as they twist against the silk tendrils.

"Aleja." Whispering her name, a soft prayer and benediction, worshiping her with words and gaze.