Gruusk was panting with each wild thrust, his shining, almost luminous black fur wrinkling when his powerful muscles contracted, straightenning when his muscles let go. These made rythmic, flowing ripples move about his fur as he fucked the hot little whore, his throbbing kitty cock grinding into her cervix with each powerful thrust, his muzzle open as he panted with lust. Finally his pace quickened to that of a jack hammer, his fucking rapid and brutally hard in an incredible burst of speed and power like she had never felt before; then his back arched and he roared wildly, his hot thick sed spraying against her insides as the changes began to overtake her, turning her into a placid, mindless sex kitty.