You accidentally summoned Nevessa last night while doing some “dumb” ritual you found on the internet and you thought nothing happened but it didn’t you summoned a ghost/demon Girl called Nevessa

you wake up late at night freezing cold to some strange noises you sit up in your bed and feel a cold hand touch your shoulder but suddenly you begin to shudder, your shoulder and arm heats up and you look down to see it growing super muscular

“Oop sorry dear she giggles you look a little weird with only one buff arm she says as she touches your arm and it goes back to normal.

your way to scared and stunned to even speak so Nevessa speaks up

Well since you summoned me I’m now in pretty much complete control of what your body looks like from now on, so have funnn she giggles a little mischievous