Please note that this is very short, and more psychological than sexual.
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All that summer the lord would spend more and more of each day just watching the wild girl. He'd sit and gaze at her sweeping the bare earth of her home in swift strokes with bundled twigs, or gathering sticks from his woodland for a fire. He'd watch as she squatted to prepare it, catching his breath at a glimpse up the belted rag she wore. It would slip from time to time as she worked, freeing a full round breast, and both its soft paleness and the hot blush of her cheeks gave away that she had known another life. But her arms and legs were now brown and slender, well-muscled from hard work, and generally dusted or caked with mud like her tangle of dark hair.
He would watch her eat the food that he brought - sometimes it was just a piece of meat for her to cook on the fire, sometimes it would be fineries fully prepared by his kitchen. Although served without silverware or bone china, still she ate it gracefully with her dirty fingers. She would lick the grease from her fingertips, sometimes catching his eye, and his heart would turn over.
She would sleep curled in animal furs, beside a dying fire, and he would sit gazing until it was pitch black and cold, and then gather himself and pick his way back through the gardens in the dark, ruining his fine clothes.
She showed him no shyness, although he sensed an inner struggle, and he would watch her scrub herself over a pail of warm water, her nipples angrily hard as she cupped and splashed, rubbing her armpits or squatting over the buckets to clean her cunt. He couldn't take his eyes from the thick hair almost hiding her lips, and he enjoyed the scent of her before she washed it away. He felt that she dwellt on her scrubbing there more than she strictly needed to when he was watching, and on occasion she would turn her back to him as she cupped handfuls of water to wash between her cheeks. After these episodes he would retreat in a hurry to the gardens, to relieve his burning desire. He barely needed to touch his cock and it would erupt ferociously and spatter the leaves, hanging in strands (he imagined her finding it, exploring it with her slim fingers).