Mewberty?

Marco couldn't move... or see. The room was too dark. Trying to spin his head around, he found that his neck wasn't being much help, either.

"Oh, man. Do I have sleep paralysis?", he mumbled to himself.

No, couldn't be. You can't move your mouth when you have sleep paralysis, right? Something must be holding me down, he thought. Searching his memories, he tried to remember how he got into this situation to begin with.

They had beaten Toffee. Well, Star did. He got in one good punch, but it didn't do much of anything. After that, he decided to spend the night there in one of the guest rooms offered by the royal family. He was having trouble sleeping that night, so he got up from his bed and tried to find the kitchen, hoping for a midnight snack ofsome of that Mewnian corn.

After that, it got a bit fuzzy. He remembered eventually finding the corn, but on his way back to his room, he ran into someone in the darkness. Who was it? Queen Moon? No, too short.

Must have been King River or Star. He waved over at them and then... he drew a blank. That was the last thing he remembered.

"River? Star? Anyone there?", he cried out. No response. "Hellooooooooo?". Still nothing, but he heard something move nearby.

"Hey! If this is a prank, cut it out!", he yelled. Afterwards, he finally saw something.

A pair of glowing, purple eyes, shaped a little like hearts. Marco briefly grimaced as he realized that Star was going through mewberty changes again.

"Star! Hey... uh, how are you doing? You okay?", he meekly asked. Star continued to just stare at him without even blinking.

"Star, answer me. What's going on?", Marco said, noticing that Star was slowly moving towards him. "You're starting to creep me out, Star!". Marco was getting more worried by the second.

Eventually, the light that radiated from Star illuminated his nearby surroundings. He couldn't move because he was all gunked up with that weird goop that she used to immobilize all the other students back at school. It was also at this point that he realized where this was likely heading and starting struggling heavily against his restraints. They weren't digging into his skin, but the lack of ability to build up momentum prevented him from making any headway.

Sweating bullets as he tried in vain to escape, Star was finally on top of him, her eyes staring straight into his. He stopped struggling for a moment, trying to think of some other way out of this situation.

"Star, come on, I have Jackie now! This is really messed up!", he shouted. Star's facial expression changed from the blank stare she was wearing to a small frown. Evidently she didn't want to hear about Marco's girlfriend. She raised her hand and... started to tear off some of the gunk on Marco.

Marco sighed. He thought she was going to do something else to him. "Thanks, Star, now we can maybe get you to your parents and-". Marco interrupted himself, noticing that Star stopped freeing him. In fact, she had barely removed anything from him at all, mostly just around the groin. Before Marco could say anything, he heard a tearing sound and felt his underwear being torn off of him, and two hands grasping him down below.

"Hey! Star, this is wrong. Stop!". He was running out of things to think to say, this situation was too bizarre. Was Star really doing this to him? For a brief moment he mentally acknowledged how hot the situation kind of was, having looked at a few bondage pics, but this was backwards and not right. He was definitely getting hard, though. He hadn't noticed it before, but Star was completely naked, wearing none of the clothing that was dyed purple the last time this happened to her.

"If you do this, I'll never forgive you, Star. Ever.", Marco said, making an ultimatum. He was still running the fantasy in the back of his mind, but this was something completely unforgivable. Rape was rape, even if the assailant was an incredibly attractive princess. "Star, if you don't-", Marco started to say, but was interrupted by Star's mouth completely covering his own, and what felt like her tongue was exploring every nook and cranny of his.

"Mfff! MFFFF!". Marco's words were completely muffled. Star's tongue seemed to be a gigantic tentacle, and it kept reaching further and further into his mouth... and then started to go down his throat. He started to gag and choke, but Star's many hands were holding his head perfectly still. After a moment, he could taste something. She was putting something into him, regurgitating something into his body. It tasted like someone had blended an energy drink and honey into a thick syrup, tasting like he was going to need an insulin shot. Marco tried to push it out of his mouth, but he had no choice but to swallow a massive amount of it. After a moment, he felt that familiar synesthesia effect where it felt like he could taste rainbows, like when you got hit with Star's magic.

Star eventually moved her face away from Marco's, wiping her mouth with one of her appendages of the apparently purple syrup that was being forced into Marco previously. Marco was too busy coughing and hacking to notice, but she had gone back to holding his member, slowly stroking it, her expression having gone from a small frown into a small smile. When Marco eventually stopped his coughing fit, he could feel his heart pounding out of his chest. What had she put in him? He tried forcing himself to vomit, but due to lying on his back and being unable to access his hands, he couldn't pull it off.

"Ah....", he started to moan a little from Star stroking him. She was moving her hand slowly and rythmically, and it felt amazing. The most he's gotten from Jackie so far is a deep kiss and a handful of boob. He was getting harder and harder. Too hard, actually. It really started to hurt. His heart started pumping incredibly strongly. He started feeling a little tingly all over, and overenergized. He could see some patterns of light that were just floating in the air, and his body started to feel like he was made of jello. But he still felt that hardness. It wasn't painful anymore, and Star was stroking him harder and harder, eventually putting his member in her mouth for a blowjob.

"Sta.... stop...", he mumbled. Marco could barely manage words at this point, his head was swimming full of colors and the amazing feeling coming from his rod. Star's tongue circling around his shaft felt like heaven, the tentacle feeling he had when she had put her tongue in his mouth was gone, replaced with pure pleasure.

"Hnngh!", Marco winced, fireworks going off in his head. He came, spurts of his seed filling Star's mouth. It felt like it lasted for an eternity. Star just continued to gulp it down, not letting a single drop spill. Marco wondered if it was over, having a bried moment of lucidity after that amazing feeling. Star, however, looked like she had other plans, and so did Marco's body. He was still at full mast, not showing even a brief moment of going limp. Was it whatever Star put in him? He felt like he could run ten marathons.

Star climbed up on top of him, slowly. Her body weight sending tingling sensations through Marco's body every time she moved a little bit. Marco didn't care at this point. His mind was elsewhere, barely realizing the situation he was in, until he felt his cock slide up into Star's waiting folds, and he immediately came, feeling himself pump a load directly into her. The rush of euphoria hitting Marco's head almost made him pass out, but Star apparently noticed, having sunk her teeth into Marco's shoulder a moment later.

"GAH! STAR, WHAT are yo..u..", he managed to say after the pain got his attention. Star started to move her hips, slowly at first. Marco was getting into it to, trying to move along with her, despite being massively hindered by the gunk he was still restrained by. He was starting to drool, though he didn't realize it. Every time Star bucked her hips, he let out a gasp or a groan, decency having long left his train of thought. As Star herself started getting closer and closer and closer to her own orgasm, she started to grab at Marco, trying to pull him tighter and tigher, scratching him here and there, and humping him harder and harder, but still almost completely silent, her own voice never escaping her lips. Had Marco noticed, he likely would have been creeped out, but his mind was too far gone.

Star climaxed, her body violently shaking and pressing her full weight onto marco's body, her breasts pressing up against his chest, letting out a deep moan. Marco felt a strange wetness but didn't pay attention to it, having given Star more of his seed in return. He noticed that a little bit of the gunk that was keeping his neck stuck had gotten loose when Star was lashing out during her climax, and that there was now a bleeding cut on his chest. When Star eventually came down from her orgasm, she noticed the wound and licked it deeply, that same purple syrup covering it and apparently sealing the wound.

And so she got back into position again and started pumping up and down on Marco's cock. Again and again and again, they kept going. Marco eventually started coming down from his high, and started to pass out from exhaustion. Star, however, apparently had other ideas and started filling him up with that syrup again. This pattern continued, Marco having long lost track of how much time had passed since he originally woke up. During moments where he could think straight, he would try to make sense of where he was, or how long they've been in here, but it never lasted long before Star noticed him not going at it with full gusto and injected him again. Sometimes, though, she would renew some  of the gunk on him and then go away for a while. He could hear her eating something when she did this, but the lack of light in the room that wasn't radiating from her eyes made it impossible to see exactly what she was doing, but a while after she was done eating, she would come back and put more of that syrup in him.

Eventually, he passed out.

"Marco, my boy. Are you alright?", a voice whispered out, waking Marco from his sleep. "Wake up. Rise and shine."

"Hu...wha?", Marco groggily replied. "River!?"

River's hand quickly covered Marco's mouth to stop him from shouting. "Yes, it's me. I'm sure you have a lot of questions, and I'll do my best to answer a few of them before Star comes back."

River cleared his throat.

"You've been, er, chosen by Star as a mate. The mating process of High Mewnians that make up Mewnian royalty is a bit different than most people's, which I'm sure at this point you've found out. Looks like you're having a bit of an easier time of it than what I got, though!", River chuckled to himself. "My dear Moon was quite violent during our time together during this, good thing we-", River stopped gushing for a moment after seeing the thousand yard stare in Marco's eyes.

"Anyway, long story short, you're just going to have to tough this out. This is an important moment during the life cycle of my daughter and interrupting it can have major psychological and physical consequences. Sorry Marco, try to keep your chin up."

River pulled out a bottle of something and splashed the contents of it on Marco. A few moments later, Marco started feeling quite refreshed, but still like he just lost twenty pounds.

"Oh, and... I'm terribly sorry about Jackie. Real shame."

"What do you mean?", asked Marco.

"Well, you see", River started, but before he could continue, both of them heard movement in the darkness. "Sorry, boy. Got to run! Try to at least have some fun.", and just like that, River was gone, having snuffed out the lantern he was carrying.

Star had come back, her eyes darting around the room, looking for whatever had just been here. Not finding anything, her eyes locked to Marco's and she began floating over again...

Eventually, Star fell asleep on top of an exhausted Marco, her complexion and hair going back to normal, and Marco's restraints crumbling away, their magic apparently spent. Marco carefully pushed her aside, his exhausted body barely able to do so. He felt different. His was leaner, more muscular... and much larger down there than he was before all this. A side effect of whatever Star did to him, he guessed, but he was too drained to dwell much on it. He started walking over to where Star had come into the room. Evidently this was actually somewhere in the castle, he recognized some of the architecture after the sun started pouring through a window. He found Rivers lantern towards the entrance of the room, and his curiousity couldn't prevent him from wondering what Star had been eating the whole time, having had nothing to fill his stomach other than what Star had forced into him. He lit the lantern and headed back into his captor's room, shining the light in the corner...

Looked like a pile of bones and meat... he recognized a human skull. There were strands of hair on the floor, some of them blonde and a few... blue ones?

And a seashell necklace.