Okay this trope has probably been seen before in the world of fanfic, but I want my turn in the sandbox.  The fandom is Stargate SG-1,the pairing Jack/Daniel, neither of whom belong to me, the rating is R-ish and this would be a drabble.
 

Pornography

by The Spike

October, 2001

Jack's back is a hard word.  Curved Saxon 'y' of shoulders to waist.
Chinese pictograph of spine: yuen, the rain dragon.  Neat Celtic 'w'
of a butt.   Lambda of crossed legs.  Scars here.  Here.  Pale and
soft against the brown. Hieroglyphs on chipped stone.

Daniel writes runes with his bare fingertips. Glyphs his own name onto
the wall of flesh.  English, Cyrillic, Mandarin, Greek.  Eyes and
birds.  Fits himself into the spaces. Jack stretches, sinuous.

"What'cha' doin'?"  The last 'l' serifs into a caress. They're both so
hard.

"Linguists," Daniel breathes into Jack's ear. "We do it in writing."