A quirk of the spell

"You know an interesting thing about that spell you used?" The pornstar asked with a knowing smirk. Harry still dazed and desperate to cum shook his head slightly. The witch’s smile turned positively predatory as she told him "It doesn't just give you a tight, fuckable cunt. It makes you just as fertile as if you'd been born with it."

Suddenly Harry was very worried about what came next. He could only think to ask one question looking at his belly bulged from the amount of cum stuffed in his apparently fertile womb.