That nipple! xD
I loved it on dA and I loved it here too!
Rin is looking smexy as hell here. Hair is my favorite part in it! :3
Just a little suggestion to differentiate between "hard" and "soft" shadows, especially in skin.
Guys with muscles have defined and hard cuts so the shadows that are casted on it are mainly hard. And tonal different
as well as diffused lighting have soft shadows.
And a lil bit of more shine in his eyes.
Sorry for being nitpicky but you know I love your art! <3