A collab with: http://aminoapps.com/p/vjxzt

Star wakes up. She stretches, and her stomach growls again. She gets out of her bed and looks in her closet. She considers wearing the light green dress, comfortable, unrestraineing, all things she wished for, but she wears the puffy blue dress, like she has been for the last week. Cleaning it each night, afraid of Moon saw her in anything else, it'd be strait back to Henious's school.

She exits her room and finds Marco and Ms. Diaz eating breakfast. The smell of bacon and eggs causing her stomach to roar with hunger, but she ignores it, just like Moon and Henious taught her to do.

"Want some?" Marco asks.

"Nah," Star lies, "I'm good."

Marco looks at Star, concerned. She's been losing weight since they met, way more than would be healthy. She rarely eats, and when she does, she usually goes to the bathroom right afterwards. At first Marco thought that she just had an uneasy stomach, but he has caught her two nights ago binge eating every bit of chocolate in the house, and forcing herself to vomit afterwards. He didn't say anything at the time, but knew he has to now.

"Well," Star smiles formally, "I'll be off to my quarters for my studies. Marco. Ms. Diaz."

Ms. Diaz gives a nod of acknowledgement and Star heads upstairs. Marco takes his plate and expains, "I think I'll eat upstairs. Still got some homework."

"Alright," Ms. Diaz smiles, "go on ahead."

Marco heads upstairs and hands Star the plate of food.

"You need to eat," he demands.

"I'm fine," Star lies, "don't worry."

"Look," Marco sighs, "two nights ago-"

Before Marco can finish Star's face glows green and she interrupts, panicking, "don't call Moon! Please don't call Moon! I threw it up! She doesn't have to know!"

"What, no,” Marco exclaims, “I know you threw it up, that's the problem, agh, look I know is none of my business but, you need to eat, you are losing weight very fast, that's completely unhealthy, please eat the breakfast, I promise Moon will never know.

“Why do you even care.” Star asks

“I’m not doing this for you,” Marco reminds to put on his facade, “I just can't stand another death”

“What do you mean by another?” Star inquires

“I… emm,” Marco notices his mistake, “ just eat the breakfast and don't mess around with my stuff.

Marco goes to his room and slams the door, planning that he will go check if Star ate the meal.

Star stares at her plate. A ravenous hunger eating away at her stomach, and will. She hides in her room to make sure nobody sees her and starts eating, not taking the time to chew as she wolfes down every bite. She looks down at the clean plate with intense guilt. If Moon was here, it'd be strait back to the school. She thinks about Marco, and how much concern he's shown for her. She wonders how he can act like a bad boy one minute, and the next, be so caring. That's when she notices a purple heart on her plate.

She panics. She flees to the rest room, slamming the door and looks at the purple hearts as they spread across her skin. Her hair begins to change to a purple color. She can't go through Mewberty. She's be sent back to Mewni. She has to hide this. She looks through the cabinets and finds some hair dye and face cream and begins to apply them to hide the purple.

Marco exits his room after hearing the bathroom door span shut. He sighs, and knocks on the door. "Star!" He demands, "you better not be doing what I think you are!"

“Star, I'm going in” Marco warns, “you better ate what I give you.”

Yeah I ate it, it was delicious, can you get the plate to the kitchen please?”

Marco enters and sees the empty plate in the floor, just as she told him.

“And what are you doing in there?” Marco asks

“Just some princess makeup routine, nothing important,” she answers nervously, “by the way, thanks for the meal, Marco, nobody let me eat and treat me like you do never, I feel more loved here than in back on Mewni, it’s nice.

“Ok Star I'm going to leave the plate in the kitchen but when I came back you must finished with the princess stuff.”

“Ok, see you later.” She responds

When Marco comes back he finds Star with a oversize pull, a scarf and a pair of trousers over her blue dress.

“Are you feeling alright, Star?” He asks “you had put on a lot more clothes than usual.”

“Ehh… yes, I’m cold that's all.” She responds, with an anxious look.

“Are you sure, you seem hot,” Marco lift his arm and touches Star's forehead, “ahh, you are burning,” he says, “Star, are you ok?”

She doesn't respond, her eyes glow purple as she grabs Marco's arm.

“Marco is a boy,” she says as her cheeks floods with purple hearts under the makeup. “He is a boy.”

“Star, what’s going on!” Marco yells “let me go!”

She starts to morph into a mewman Butterfly hybrid, a pair of wings grow on her back, her skin turns purple and the eyes become two glowing hearts.

The hearts are a deep purple, glowing through the extra clothes and make up. The dye in Star's hair dissipates magically as she carries Marco into the sky by going out the window.

"Star!" Marco exclaims, "put me down!

Star offers only an unnerving smile and continues to ascend. Marco drops the act.

"Star!" He begs, "please! I can't lose anyone else! Even if I haven't known you for long, I can't lose you!"

Marco starts crying, "please... not again."

Star looks down and sees Marco's tears. This snaps get out of her magic induced madness. She quickly lands as the mewberty fades from her eyes and face. She wiped the make up off and sheds the extra layers as she sets Marco down in the cemetery.

"I'm so sorry!" She exclaims, "I didn't mean to-"

Marco puts back on his mask, drying his tears, "don't worry. It's fine. Look, I'm not sure what just happened, but maybe today's not a good day for you to meet other humans. You should just head on home. I'll be right behind you."

"That was mewberty," Star explains, "it happens to some Mewmens as they develop magic. I'm sorry you had to see it. Please don't tell Moon! She's send me back! I can't go back!"

"Back where?" Marco asks.

Star realizes her mistake and quickly lies, "nowhere. Don't worry. Well, I'm gonna go. See you at home."

"Whatever," Marco continues his facade. For some reason, he keeps slipping out of the act when he's with Star, and he's not sure why.

As Star walks around the corner, Marco heads up to a gravestone and sits in front of it. The name on it: Mr. Diaz.

"Hey dad," Marco sighs, "it's been a few weeks."

Star secretly listens in, worried about Marco's inconsistent personality as she hides behind a tombstone.

"So," Marco continues, "I've been hunting down the guy. You know. The one you were nice to and he shot you in the back? Ugh. Well, at least I learned one thing."

Marco takes a gun from his pocket and examines it, "nice guys finish last. It's not easy though, being... this, but if I'm not, then I'll get killed, like you, but don't worry..."

Marco smiles with malice and grips his gun, a wild look in his eyes, "I'm getting close to finding who killed you. It won't be much longer now..."

Star decides to head back to the house, quietly sneaking away. When she enters, she sees Angie, crying.

"Are you OK?" She asks.

"Oh," Angie wipes her eyes, "I'm fine."

"Is it about... Mr. Diaz?" Star asks.

Angie sighs. "It's a... long story."

"I've got time."

"Alright. It was a couple of years ago. He was walking with Marco to the park. They were mugged. He tried to reason with the mugger, but... the mugger gunned him down. The police gave up on the case years ago, and Marco... he's not the sweet, innocent boy he once was. I'll tell you that much. I just... miss him."

"It's OK to miss him, but you do have to try to move on."

"I know. Thanks."

"Anytime."

Star gets up and heads into the kitchen. Going through mewberty rendered her famished. There's a large plate of fresh bacon, sitting there for the taking on the counter. Star tries to resist, but eventually takes just one strip of bacon. After eating, she heads to her room and prepares to vomit, but...

She can't. She can't seem to bring herself to do it again. Marco lingers in the back of her mind. She ignores the fear, the fear of being fat, when she is indeed quite skinny, for Marco's sake...