Aaron Johnson

With all the cgi trickery and prosthetics involved in film and full frontal scenes nowadays it’s difficult to say most of the time but it’d guess that is all Aaron.

He’s definitely well hung but it’s not exactly a flaccid penis either, he looks chubbed up and hanging. It Moves more like something that slightly engorged too. Not a criticism, most actors fluff a little, even for that extra half an inch.
 
This may just be a rumor but I heard they had to digitally reduce his bulge in Kickass in post because it was too prominent in scenes where he wore his superhero costume
They def did something for sure to reduce his bulge in the film as in the behind the scenes photos he is clearly bulging heaps yet in the film you really dont see it much.

It's crazy huge but I guess he was simply blessed.
He is indeed blessed beyond the max!

He’s definitely well hung but it’s not exactly a flaccid penis either, he looks chubbed up and hanging. It Moves more like something that slightly engorged too. Not a criticism, most actors fluff a little, even for that extra half an inch.
Certainly possible for sure.