Invasive Species (Patreon)
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Nature finds a way.
I thought of this as, "What if The Last of Us, but feminization?"
Just like the fungus in the game was based on reality, this caption is also based on a real feminizing parasite.
When a female Sacculina is implanted in a male crab, it interferes with the crab's hormonal balance. This sterilizes it and changes the bodily layout of the crab to resemble that of a female crab by widening and flattening its abdomen, among other things. The female Sacculina then forces the crab's body to release hormones, causing it to act like a female crab, even to the point of performing female mating dances. If the parasite is removed from the host, female crabs will normally regenerate new ovarian tissue, while males usually develop complete or partial ovaries instead of testes.