Pretty wild comic on e6 by reiger, which I think is another name for a guy that drew some great furry BB
https://e621.net/post/show/145319
Includes every kink in the book, even ballbusting and **********.
Here's links to a few pages of relevance here. It's by no means every BB from the comic but enough to get you started.

Dranz’ nuts get grabbed, squeezed, then ********** threat
http://e621.net/post/show/151811

Penectomy threat
http://e621.net/post/show/151812

Drake is fitted with a chastity belt that squeezes his nuts
e621.net/post/show/151813/

Dranz has a problem with his chastity belt
http://e621.net/post/show/151846/