Mistress Kathrin wants to play with her slave today. She's going to play a guessing-game and every time he doesn't know the right answer he'll get his ass spanked. That's how Kathrin likes it - she loves to be in control and that's why she cuffed the slave's hands. She punishes every false answer with a severe hit of her riding crop - just like the slave deserves. But after the game she thinks the slave deserves even more spanking, she gags his mouth and starts beating him again. Then she gets on his back, makes him her human pony and keeps hitting him severely!