I had the following idea for the :"lore" of a game.

There's 256 girls born with a mutant gene, like X-men, but that gene grants them to become like magical bitches that can shoot magical fireballs.

So they can go and fight like Goku and his hoes and Touhou.

But the issue is that they need to release like big clumps of the chaft of that energy.
Otherwise they will suffer a lot of pain if such energy isn't released.

But the only way to do so is to defeat another X girl in battle, because those are the rules of the magical ritual, that only one will be granted the victory.

But winning the battle, means that they will magically spawn a giant futa dick.
So if they win the battle they can use that dick as a funnel to expell the energy into the hole of another X cum girl.

In the end they're like forced to live in a remote island where they can magically fight each other.