
That is eye candy. Asami is the total package from head to toe. so, I am not surprised that his packing down there. Akihito is a very luck man. Lol.

I think it's also a question of perspective and Yaoi hands. Hands are bigger in yaoi, and the penis is in Aki's hand, and closer to the the viewer that Aki's surprisingly tiny face. :)
Also in some art forms, scale is adjusted to show the relative importance of various aspects of the picture. For example, in ancient Egypt, kings were always drawn as being bigger than any other person. Royalty was represented as bigger than anyone common, citizens bigger than servants or slaves, and the head of house was bigger than rest of the family. This tells us that Asami's penis is extremely important and that we should pay attention to it.
http://www.mangago.zone/read-manga/you_re_my_loveprize_in_viewfinder/mh/v07/c043.1/17/
Asami's penis looks huge here comparing with aki's mouth and hand i never notice the size of his penis before ლ(´ڡ`ლ)