how bid do you think his dick is? sometimes it looks big and sometimes it looks small to me!
I mean, we are guys, so I assume we know the size of the dick usually are not regular, depends of many factors, the level of erection is not the same, some dick can be very tiny flacid and a monster erected, the way the dick is the underwear (position), eve the weather, sometimes the balls can confund the dick size if both are too near in the underwear,etc
But in my opinion, he is very confortable with his body and apparently he have also a high self-esteem, so I think he must have a big dick, maybe not a monster cock, but a big dick, above avarage