With each thrust she was fucking him as surely as he had fucked her, Amanda was amazed that she could still squat, her body burnt from the effort, but still she drove herself on.  His challenge was her inspiration, his counting was her motivation, onward changing the pace to meet her own needs, to avoid her fourth orgasm until she made him cum inside her.<br/><br/>As she reached the early sixties Amanda could sense that Simon was close, he was large enough that she could actually feel his cock twitching as his orgasm approached.  This drove her on even harder, there was no way she was going to let him get to seventy five, and at seventy one he exploded deep inside her triggering her own orgasm.  Amanda's entire body going into spasm as she squirted around his cock, her cum mixing with his as he fired into her over and over.  As he sprayed the third string of his semen into her, he called for her to keep going, but this sounded strangely weak, but when the next load emptied into her, he repeated it, stronger and more challenging. Amanda made it to eighty but then her last reserves of energy and determination failed her and she collapsed onto him, his thick cock still hard and deep in her well used pussy.