A cruel and selfish king becomes frustrated and angry when his wife has yet to produce an heir after an entire year of marriage. In secret, he pays a visit to a witch, demanding that she use her magic to help him get the heirs he believes he's owed.
"How many heirs would you like?" she asks.
"As many as the cow can produce!" he responds, and the witch smiles and nods. She gives him two potions, one for himself, and one for his wife. They're different in appearance and impossible to mix up, but he's still careful not to confuse them.
After drinking his and hiding his wife's in her drink, the two of them become insatiably horny, and begin fucking very regularly. He's pleased with this result, not only for the obvious reason of it being enjoyable, but because he's certain this means the potions are working.
Within three weeks, his belly is swollen, but the queen's remains flat. They continue to fuck at least once a day, if not several more times than that, but he's still the only one growing. After only two months, he looks obviously round with child, while his wife is still as thin as the day they married.
Eventually, it becomes clear that the witch fulfilled his request, but not how he'd intended. Each time he and his wife have sex, at least one additional baby begins growing in his new womb. He develops a birth canal and his chest swells into a proper pair of tits to feed the endless brood. When he isn't fucking, he's eating, rapidly packing on pounds and pounds of fat.
At merely six months, he's massive, so full and round with babies that he's completely immobilized. When he finally begins giving birth, he continues pumping out babies daily, and sometimes to multiple in a single day. The king's birthing becomes so regular that no one bats an eye when he begins groaning and wailing before a baby flops wetly to the floor between his legs and filling the room with its cries.
