[Okottei] Birth Sex Monster Gumunculus! [English]

A witch finds herself unexpectedly overwhelmed by a massive, pulsating monster creature. Despite her initial hesitation about the sheer size and relentless nature of the beast, her body reacts instinctively to the overwhelming sensation. As the creature's sheer volume begins to stretch her limits, a conflict arises between her logic and her physical cravings, leading to an inevitable transformation of her abdomen. What starts as a sudden encounter turns into a permanent change as her body adapts to the massive presence within.