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I knew it was real by Hasen
Fandoms: Batman - All Media Types, Superman - All Media Types
16 Apr 2026
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Summary
He didn't remember consciously making the decision to bite Kal. One moment he was all instinct, ready to shift in order to protect his mate and then he could taste Clark's blood. It was bitter on his tongue, the taste was probably due to the kryptonite entering his bloodstream. It didn't matter; his venom would eliminate all traces. After a few moments, the other stopped struggling; his venom was taking effect.
Bruce barely had a few minutes of peace before his worst nightmare unfolded.
Kal’s body shuddered and convulsed, a scream ripped his throat. The bite on his neck, which should have been healed by now, began to ooze. His veins began to bulge with a greenish color, and his hands tried to scratch the wound on his neck.
This wasn’t the normal reaction expected from a mate.
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When Clark is injured after a battle, Bruce gives him the Mating Bite in a desperate attempt to save his life.
For shapeshifter mates, the bite's venom helps them heal; however, Clark's Kryptonian body seems to be allergic.