Heidi needs sex. No problem, she just uses her slave. Sex is not in the least bit for his pleasure though, so he's bound to a chair and blindfolded. To Heidi he is just a penis, nothing more, to be used as she sees fit. "It's for me not you" she reminds this slave as she bounces up and down on his penis, using him as her whim desires. When she is finally satisfied, she simply abandons the slave, left to be used again later when she feels the need.