You have a will of iron

With your cock thrusting into her hot body, she rakes her fingernails across your back, causing you to arch and groan. She hurls her groin into yours even harder, and her words turn to wails of ecstasy, as waves and waves of rapture crash over her. She wraps her legs around your waist while she climaxes, pulling your body tight to hers. The increased pressure on your penis blows your mind, but you clench your muscles and hold off your orgasm. As your whole body shakes with the effort, her pulsating muscles redouble their efforts to squeeze you, extending her pleasure even longer. Her convulsions subside and you pull out of her. She smiles at you and huskily whispers, "I owe you one."