A few stories.
There's Comic Book ENF and Superhero ENF on Chyoa, as well as a few other stories that contain superhero enf. There are countless such stories on OCC as well, a few of my favorites being: Get Jinxed, Black Widow's Bad Luck, A Different Kind Of Catfight, High Noon on Pandora, and Mortal Kombat-Finish Them, all by bbettyblambabam.
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