Also, if there is/was a lump higher up, it can cause a crease which continues in that same path, making it look like it keeps going. Could be anything I guess.
After watching the clip several more times and examining it more closely (LOL!) it looks to me that there are two things at play creating that very long bulge.
One is indeed as you point out - a crease caused by a lump, but at the bottom.
I think this is the something in his pocket I mentioned earlier.
However, if you look closely at the crotch area there also seems to be another lump, or rather a pointy bulge.
This, I think, is more likely his actual dick head showing through. Look especially as it catches the light, where it is more clearly visible.
These two things come together to create what appears at first glance to be one massive bulge.
Look closely also just as the bulge goes out of view, where you can see that it breaks in the middle, proving (to me at least) that it is not one huge, long cock we're seeing that is creating the bulge.
Whoo.. I don't think I've scrutinized a bulge like this ever before. To top it off, I've never been much attracted to Frank Sinatra. Actual evidence of a huge dick sure would've helped to change that, though.:biggrin1: