Sporty or not, all women cum at different intervals. Quick cummers, slow cummers, don't be so down on her (pardon the pun). If you think the foreplay is kindling her flames then cut back on the kindle. Experiment with her range of pleasure. Maybe your technique is just so advanced for her clitoris that she can't hold back. Congratulations, stud...you've got a hot hottie there who wants what you've got to offer. Aren't YOU the lucky guy on the block!