At my father's suggestion, I switched from sprinting to middle distance running after he was a former Olympian. However, my record wasn't improving as expected, and my father started giving me even more intense humiliation training than usual... While I was embarrassed, he insisted it was for my record, and began training by straddling my erect cock, teasing me relentlessly... The athlete's blood flowing through me tightened my pussy, urging my father's thrusts...