The serf's mouth is a hot, wet haven for the mistress' feet. He suckles her toes, his tongue tracing intricate patterns on her soles, his breath coming in ragged gasps. She smiles, her eyes gleaming with cruel intent. She raises her boot, the heel glistening with his saliva, and brings it down hard on his back, marking him. He moans, his dick twitching, as she alternates between pleasure and pain, her foot and the crop dancing a symphony of dominance.