Star Butterfly was sleeping peacefully when the slimy green invader that had been watching her finally pulled itself onto her bed. The wormlike creature had crashed onto this planet shortly before, slithering out of the crater of its meterorite out of curiosity and neccessity. It was on a mission to assimilate the lifeforms of this planet, and the giant castle tower sticking out of the house it had noticed caught its attention. Pulling itself up to the window of the tower, it immeditely caught sight of the sleeping blonde, and knew what it had to do. Luckily she wasn't smart enough to close the window fully, allowing it to enter the princess's bedroom unnoticed.

Now on top of Star's bed, the creature quickly got to work. It wrapped its tendrils around one of Star's legs and pulled itself underneath her nightgown. Finding a piece of pink lacy fabric blocking its entrance, it pulled back the waistband with its tendrils and quickly moved underneath her panties. Finally, it found what it was looking for: a slit in between the girl's legs that it could use as an opening. Using its tendrils, the creature spread the slit open and pulled itself into Star's pussy, causing a moan to escape from the blonde's mouth. In its haste, the creature brushed against Star's clitoris, causing the princess to orgasm as she let out a loud scream. Undeterred, the creature pulled itself all the way through into Star's womb, her orgasm making it easy to slide through her nether regions. It began making its way up through Star's body, passing internal organs, until it moved inside her head and found what it was looking for.

The creature buried its tendrils into Star's brain, the appendages burrowing deep inside of the organ and covering every last inch of it. Star suddenly shot awake, her ocean blue eyes now glowing green and her face twisted into an evil smirk, as her body was now under complete control from the creature. Looking through Star's memories, the creature saw dozens of potential hosts its species could take over just like the blonde. Grabbing her wand, the creature set to work on contacting its home planet, ready to start its assimilation of the planet.