That particular compliment is not one he was expecting, and he clearly looks a bit surprised. Though if he's blushing, it's almost impossible to tell at this point, as he's already fairly flushed.

"Look who's talking," he breathes after a moment. It's not the most romantic thing he's ever said, but it's all his brain will produce at the moment. His gaze of affection and wonder mirroring her own probably speaks volumes anyway.

He steadies himself for a moment, before drawing back and then thrusting again, starting a slow but deep rhythm. Angling himself so he rubs up against her clit as well when he's fully inside her. Locking eyes with her the entire time.