He loved seeing Percy like this, the self control lost when pleasure took over. He kept his eyes on focused on Percy's, not wanting to miss a single glance. He moved slowly, taking his time, swirling the tongue around the head when he pulled out and taking Percy as deep as he could on the way in.
Every noise Percy made had his cock growing harder (if that was even possible) and the look in his eyes made him want to never stop at all.