So much of fandom wants to make Shinji into a cuddly-wuddly Aki-lovefest, which irritates the hell out of me. He's not supposed to be that likeable -- he's stubborn and rather an asshole. Which is all to say...this is awesome and congratulations on the grand achievement of making me enjoy a Shinji piece!
I particularly love how you twisted the prompt line. He DOES know the back of Aki's hands; that rings so true.