"Ah," Ichigo shivered as the brush, startlingly cool with the new batch of ink, lightly touched his skin. New calligraphy supplies, and the first thing that Orihime had thought of was to use it on him.
"Shhh, hold still, " Orihime murmured, too preoccupied with the characters that she was inscribing down his back, laying one careful, dainty stroke after another. It wouldn't do to make a mistake, she wouldn't be able to erase it. Not without a mess, anyway.
Ichigo swallowed and buried his face into the futon, trying to resist the urge to tremble. It had only been ticklish at first, when she started at the back of his right shoulder. But with him lying on his stomach, unable to see or hear anything that she was doing, forced him to concentrate on each feathery stroke. The palm of her left hand on his shoulder blade was warm, keeping him pinned. Wisps of hair trailed behind the march of written words.
"Inoue..." Ichigo begged, as a slight tremor ran through him. Her lines had progressed to the middle of his back, where it gradually dawned on Ichigo exactly how sensitive that area was. Clenching his hands into the sheets, Ichigo fought the urge to grind his hips. He spoke again, voice straining as Orihime continued inevitably down the base of his spine, "W-what are you writing anyway?"
"A secret love letter, " Orihime whispered behind him, blowing softly on the last glistening letter as Ichigo moaned, "and a plan to take over the world."