Spermfangs are a ferocious feat You are sometimes prophesized to wield!
If this feat is true, spermsteel grows naturally along the inside of the Godcock's urethra as spiral rows of cockspikes pointing outwards. These can be retracted or removed harmlessly; possibly even be blasted away with every single fucknuke only to regrow later.
Because the spikes lean so far outward, while present You can't feel them and they don't interrupt any outward flow. However, anything which travels into and down Your urethra is bombarded with rows upon rows of razor-sharp Godsperm. This not only slashes through any cockvored slut but provides ample drag and resistance! (Supposedly this trait evolved as a defense mechanism to attack bacteria or other bad things that would seek entry; it exists to protect You.) (Huge bonus points if these are used for futacide.~)
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