According to Daz's measure metrics, Blake's penis is about 8 cm long, which is smaller than average (about 11 cm), but not by much. In fact, most men in that regard are closer to Blake than to Samuel
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I think, the main reason it looks smaller than it actually is in reality is because it's situated between Blake's massive hips.
Plus, there's also a technical aspect. Starting with v0.13 I mostly stopped using the generic bulge morph, and started actually putting Blake's dick's model in his panties. And it would be a lot harder to tuck it in if it were bigger.
I actually do plan something like that for the domme Ambrosia route eventually