Sirius enjoyed that look in his lover's eyes -- as if he was all the world. Gaius was hot and strong around him, but stayed almost still, waiting, but alertly, like a hunting cat. The words were permission -- or more, a request -- to abandon control for the fulfillment of desire. Sirius was only too willing to comply.
"Oh, you do," he said, his voice low. He began to move, and each thrust tempted him to go faster. "Need you, Cat. Want you." Want you here, now. He growled and bit at his lover's skin, wanting the taste of him -- skin and sweat and fresh forest air, and Gaius responded, curling into him and matching his pace. Almost without thought, Sirius reached down to touch him, to carry him along in his own rising wave of pleasure.