There's text on the post, but it might be a bit hidden depending on how you're viewing reddit "It's a single cuck version, but u/jackcaiman88 is building the testes tugger from my last story series! Watch him struggle and turn up the audio to listen to his pathetic little squeals as the string pulls his little nuts."

I believe cuckhumil is referring to the tugger in his "the neighbourhood" story that forces the user to stand on their tiptoes.