'Oooh, yeah,' I moaned, reveling in delight, as he slapped me harder and harder. At a certain moment I understood that he was beating me up as hard as he could. My ass felt like it was on fire, my moans turned into screams, I was jerking in my bondage and my ass cheeks were contracting and relaxing again and again, as if trying to avoid the blows. But I couldn't break free as my bonds were way too tight. 'Enough! Stop it! Rolf, cut it!' I was already begging Rolf to stop. He slowed down but his blows grew heavier! My cheeks were jiggling like jelly and my whole body was shaking in the same rhythm. I bet my ass was all red from all the blood rushing to it.