How to make a sock gag

It’s so simple, but effective. I really need to do this more… I nearly always forget in the heat of the moment of a scene. Found this on tumblr… if anyone knows the source, please let me know. How about some inspirational examples?

TFG’s subs: Justinnnnnn, Part 2

Justinnnnnn gets to know my smelly socks and shoe while hogtied. Then he finds himself spread out, tape gagged, and clips on his tits. All the while, I teased and edged him with the Magic Wand. There was a lot of moaning.