He's giving her the control? She hasn't begged, or squirmed, or otherwise asked for it. It throws her off just long enough to feel a barb of nervousness, present with every slight movement she makes. He totally eclipses the room, so much bigger and broader that she feels swallowed up by shoulders, and hips; barred in by arms.

She tips her chin to her chest to see what she's doing as he levers himself into position, though there's more shadow than light between them. She guides him to her opening and swallows a breath, rubbing against his head before she lets him push inside her.