I scavenge the net in my free time to find them. Blogs, google etc. here are a few more unlucky ones. Perhaps some of the more imaginative guys can make up a little story or something to go with them
Castration slow and painful? I can think of an idea...
Tie up one of these guys and attach a ball-lock on their nutsac - pretty much keeping the testicles separated from the cock and preventing them from "escaping" back into the body...
Then I'd start edging one of these tied up guys for about an hour - working their hard young cocks close to climax, only to stop - interrupting their cum. When I finally decide to allow them to cum, I take a hammer and smash one of their testicles into pulp - the guy will likely gasp with a look of stunned horror as his eyes roll up to the back of his head. He'll likely start involuntarily twitching/writhing while his cock dispenses not only cum but a mixture of blood from the crushed testicle as well.
Maybe I'll think up another ingenious idea for the other testicle...