This was our first free Saturday in aeons.  I'd been looking foward to it for weeks, and I had been planning this all week.  As soon as my slave cleared the breakfast dishes, I got up and grabbed her hair.  I pulled her roughly towards the bedroom, grabbing our knife on the way.
<lj-cut text="Caution, not for everybody.">As we entered the bedroom, I thrust her onto the bed.  "Kneel, bitch, and stay still."  As she got up, I flipped the knife blade out, making sure it locked into place.

She knelt, but was none too still about it, as she always is.  Gently, I pressed my free hand against her back and pressed the flat of the cold steel blade against her shoulder blade.  At the touch of the steel, her struggle ceased and her body relaxed.  My arm folded around her, and I traced the back of the blade up around her shoulder, and down the breastbone.  "You want this, don't you, love?"

She nodded her head, and I heard an emphatic "Mmmhmm!"

As she relaxed yet more under me, I started working her back.  Tracing light strokes on her upper back, finding the pressure her skin could take today, I heard small sounds come from her throat, like a kitten mewing.  I knew now that she was well under, loving the sensation of the steel against her skin.

Satisfied I had the right pressure, I started doing more.  I traced some symetric curves on her back, fashioning an elaborate arrow pointing downwards towards her beautiful ass.  Never breaking contact, but instead flipping between the point and the back or flat of the blade, my hands drew beautiful light shapes on her pure white skin.  Satisfied with her back, I traced around to her arms.  On her right bicep, I chose to trace a simple caduceus, the doubly-entwined snake.  On her left, I traced a crude knife, to leave her with the memory of today.

At this, I drew back to look at my work.  Without my support, she fell forward to rest on her hands, displaying her lovely back for my gaze.  To my delight, the slightly raised mounds where the knife had passed glistened with only a few drops of blood.  I grabbed my digital camera and snapped a few quick photos for posterity.  

Coming back to my beautiful canvas, I pulled her hair aside to look at her.  The content smile on her face and the look of ecstasy in her eyes touched my very soul.  Casting my glance downwards, towards her luscious, full breasts, I new I had one last touch to make before I was done.  Very carefully, I traced the letters, from left to right, on her breasts: "S", "L", "U", "T".  That done, I wiped the knife with a soft cloth, folded it, and set it on a counter, to be sharpened later.  I needed to bring my slave back up.

I took a cloth, moistened it with an alcohol mixture, and wiped down the marks I'd made on her.  She shivered as the sting from the alcohol bit into the few marks from which a droplet of blood had sprung, but still sat limply on the bed.  I carefully took her in my arms and whispered softly into her ear, caressing her with my hand.  Slowly, she came up and shook her head slowly, blinking.  A bright smile came upon her face, and she looked full into mine, saying, simply, "I love you, sir."

I carefully hugged her tight and lay her down on the bed.  I snuggled next to her and my arms melted into her soft curves.  Soon, after I was sure I had her full back, we'd rise and view the pictures of my work, and take more.