"Oh, God, Sis!" he whispered, completely surrendering to her loving caresses when she momentarily released his tingling boner from her fingers. "Don't stop honey… don't stop!"

Grasping his prick more firmly in her trembling hand, she was shocked at the expression on her brother's face. His mouth was gaping open, with his lips drawn back from his teeth while his glazed eyes rolled up crazily toward the ceiling.

A feeling of triumph surged through her body when Marci realized how easy it was to control a man's emotions through the manipulation of his cock. She couldn't believe the intense power she had over his body as she rapidly learned how to please him. The faster she stroked his cock, the wilder he shivered and lurched, and when she slowed down the action, he moaned and begged for more. This was the first time in years that her big brother hadn't dominated her.

"Please don't stop, Sis!" he groaned when she again momentarily released his prick. "Oh, God, honey, don't stop! Please don't stop!"

Kirk thought he would lose his mind with ecstasy as she brought him close to a climax time after time, only to let him slip back and skillfully bring him up again.

"Oh, God, honey, that feels so good!" he moaned as her gentle fingers continued deliciously stroking the length of his throbbing cock-shaft.

As his body began lurching more violently, Marci began instinctively moving her hand more rapidly up and down over his big, straining prick. Crazed with the wild excitement, she could feel her hot cunt juices oozing out into her panties. She was pumping faster and faster while her brother lurched and moaned on the chair. Kirk could feel an explosive orgasm building up deep in his balls. He felt as if his blistering prick was burning as his jism started its fiery journey up through the tingling length of his cock.