
I dunno. The few naked side shots we have make appear as if he may have a skinny ass. So unless-- I mean UNTIL-- Sensei draws it in it's full glory, I'm going to conclude it's lacking, or pockmarked, or scarred...
Old gunshot wound perhaps? Did he piss off the wrong lover? (Heh heh heh)
Or he has an embarrassing tattoo :P
But by all means, anyone feel free to post a link if you find a nice shot ;)

This http://www.mangago.zone/read-manga/you_re_my_loveprize_in_viewfinder/mh/v07/c043.1/21/
Sneaky backshot but looks ok to me...
Isn't Asami Ryuchi the the best yaoi manga seme ever. He gets first place for eroticness, sexyness and possessiveness. Not to mention that he has the right balance of elegance and danger . Plus mannn he's good at giving it to Akihito