Gonna say this straight up, this isn't canon at all. Only because Mnemiko can create fake memories and imagery to confuse Wallop. So while this might be something Mnemiko would want to be real, it was just made to make Wallop feel uncomfortable... OR is it real? It's probably isn't because getting a prong like that in Wallop's cloaca isn't pleasurable at all. It stimulates some levels of anxiousness that MIGHT feel like pleasure but it's not something worth doing more then once either way.