((I just noticed this post is 1944666. Appropriate!))

When Nathan felt his hair being tugged he made an encouraging sound around Charles' cock, which became a low hum as he alternated between curling his tongue around the head and sucking. He'd presumably given enough head over the last few months to pretty much know what he was doing now, and had fun trying to provoke certain responses. He kept hold of Charles' hip with a hand, fondling his balls with the other.