Bruce had been about to answer her cries when he felt her lips close around his erection. He'd opened his mouth but only an "Uh-unnnnggghhhhhh......" had managed to escape from his lips. He sighed, abdomen muscles flexing as he watched her with dark eyes. Slowly, he began to rock his hips against her motions, pushing himself a bit deeper down her throat with each pump of his cock and moaning. He ran his strong hands in her dark hair. "Oh, god, Zanna... f-fuck..." he whimpered as his hair began to stick to the sweat on his brow and his abdomen quivered from the strain on his muscles.