Ff
http://www.mangago.me/read-manga/hashi_no_xl_saizu/
I'm not entirely sure about the uke thinking the seme's dick as the biggest in japan, but he does think the seme's dick is pretty big. (I'm sure u can guess that from the title XD) Sorry if this isn't it though.
That makes me think of Down and Dirty try that?
Yahwacheop (painter of the night), great art, such drama-filled plot, and its definitively what you're looking for.
I already read this one but thank you but this isn't it
thank you but not that one
im looking for a yaoi where the uke considers the seme dick to be the biggest in japan. I think one of em is a salaryman and the other is a dj.