Futanari Princess

A king couldn't satisfy his queen, so he made a bargain with a stranger and then reneged on it, and the payment came due on his unborn child instead. That child is born with both male and female traits, hidden away in a distant castle and raised by servants who know exactly what they're covering up.

The curse doesn't stay quiet forever. As the heir nears eighteen, the changes it brings start surfacing, and the story sits in that stretch between secrecy, sin, and whatever destiny the stranger intended. Whether the curse gets escaped or just gets embraced is the actual question the game is asking.

Play moves through a sandboxed castle and its people, with the heir exploring, teasing, and acting on the urges the curse won't let stay buried, building toward the encounters the setup keeps promising. It's an early release covering one zone, so treat it as the opening chapter rather than the whole castle.