You should already get the gist of what I'm going to say - I. Own. Nothing.
Now it's Star's turn.
Unfortunately Star is too innocent for her own good.
~Enjoy~
After the weird fiasco at their camp that morning, Star and Marco made their way into the town of Mewni, children running to greet them, one even climbed up Star's tail and got a piggyback ride from her, both laughing all the while. The children loved her and she loved them all just as much, their parents were wary of her because of her tail - until they saw Marco with her and figured she was good, since Marco never hung out with bad people.
When the guards saw Star surrounded by the children, they were quick to question her antics until a toddler climbed up her tail and hugged her around the back of her neck, and then they noticed the pink hearts and light blue hair.
Star gently took the little Mewman toddler off her back. "I'll come back and play later, is that okay with you guys?" She asked, crouching down to be on eye level with the tallest of the group. "Ye!" The oldest said with a toothy grin - before all of them waved goodbye as Star and Marco entered the castle.
They were escorted by two of the guards to the throne room where River and Moon were, Moon was quite surprised to see Marco with a supposedly random girl in the throne room, and River was somewhat appalled by her tail. "Queen Moon, you may not remember her but this is Star, Star Butterfly." Marco said as he gestured to the girl with similar hair to Moon.
Several minutes of arguing later...
Star led Marco up to her room where she immediately went and jumped on her bed. "I am so happy to be on my bed again!" She said with a smile as she lay down on the bed. "I'm glad that you're happy. So, um... Would you want to meet my friends, later?" Marco asked sheepishly. "Your friends? Sure!" Star said happily as she pounced on a nearby pillow.
So after almost an hour of Star readjusting to the castle, she and Marco went to visit Jackie - who evidently stayed in town with Hailey, even if Hailey worked in the castle she preferred living with Jackie - mostly because she didn't want the bleach blonde to feel alone.
After saying 'hi' to Jackie and Hailey, Star and Marco made a trip to the underworld to visit Tom, Janna, and Tom's family - one thing's for sure is that trip ended badly.
After leaving the underworld, Star retired to her bedroom for the night, while Marco stayed in the upper levels of Star's room - since he didn't have a room in the castle that he remembered. They spent all that afternoon up until dinner messing around with magic in Star's room, then spent some time saying 'hi' to everyone in the entire castle before actually eating dinner.
Later that night...
Normally by such a time everyone would be asleep, but one person in the castle remained awake - Star Butterfly. Who was trying to deal with getting rid of her strange desires by 'fingering' herself with her tail - which only served to do the exact opposite. So she eventually gave up using her tail and climbed up to Marco's bed and lay down next to him.
She lay there beside him restlessly for almost half an hour until she felt something poke the side of her knee, so she went under the blankets to find the source - something in Marco's pants, why did she have to be so naturally curious about the body?
She reached into Marco's pants and found a warm length of sorts, it was somewhat soft but also hard to the touch, she slowly began moving her hands along the hardening length of flesh until she decided to try something - she pulled down Marco's pants a bit, and came face to 'face' with the object in question.
Beginning to lick it she found that same strange taste and salty smell, tilting her head she slowly took it in the mouth and tried sucking on it - the smell was intoxicating, strangely she found herself rubbing her tail on her nether regions until she found her own release - on Marco's face, she didn't even notice it. Star climbed back down to her bed and went to sleep.
Next morning...
The first thing that Marco smelled that morning was vanilla - lavender vanilla, meaning Star had to of come up to lay down with him that night. There was something sticky on his face, so he wiped it off with his thumb - it was a clear liquid, but it smelled like Star. "She's too innocent to have done something like that. Right?" He asked himself.
Which once again beings another chapter to a close.
Unfortunately Star has no idea what she's done.
Marco knows she is all too innocent to do so otherwise.
The course of the future changed.