How to kill a Hydra: cut his dick as many times as possible, making sure many more grow, and then start teasing him. The overflow of blood towards the groin area should cause instant fainting.
What if you half-ass it on accident and he doesn't grow enough dicks to pass out from the bloodflow, and all you've done is create a very horny creature with way more dicis than you can handle? 👀
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Source - The Gamers: Hands of Fate
because if not, that might be a one time use kink
Hercules defeated the hydra through extreme cock and ball torture.