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Stack's Womb Marking refers to a particular womb marking that appears on partners of the character Stack after he has sex with them. It is a blue heart-shaped marking with four yellow sperm cell shapes moving toward a fennec-fox shaped marking that looks like Stack's head in the middle of the heart, surrounded by four yellow lightning bolt markings on the outside of the heart. While it resembles a womb tattoo, it is not the same as one; it physically changes the fur color of the person it is applied to. The transformed fur even carries Stack's scent.

During sex, specifically when he cums inside his partner, Stack may "tune" his partner's womb to himself which makes the marking appear on his partner instantly. This impregnates them without fail and applies a magical curse. This curse increases the production of fennec fox offspring and prevents insemination by any sperm other than Stack's own, effectively marking certain partners as his breeders permanently. It is unknown if this marking can be removed.