I finished watching Fionna and Cake a while ago, and I absolutely loved it, especially what it did for Simon and his story. The only thing I wish we had was a moment at the end with Simon sharing his experiences with Marceline. Like, Simon is one of the most important people in her life (aside from Bonny, ofc), so it felt weird that the only thing we got between them was an interrupted phone call in episode 2. And after everything he went through, I definitely feel like he would be more open to talking. So here we are.

This is my first attempt at writing this genre, so I hope you enjoy.

"You want another refill, Simon?"

"Thanks, Dirt Beer Guy, but no. One is enough. I'm waiting for someone."

Simon nervously occupies his usual spot at the Candy Kingdom Tavern, his fingers tapping restlessly. It's been a month since he began his therapy sessions with Minerva. After sorting out his thoughts, he finally mustered the courage to call back Marceline, expressing his desire to talk to her since their last conversation over the phone had ended abruptly. Fortunately, it was late at night, and at this point, the only other people left in the bar were himself and the reanimated bartender. The doors suddenly swung open with a squeak as Marceline floated through the entrance.

"Marceline." Simon smiled, his voice tinged with a mix of joy and nervous anticipation. He rose to his feet, his movements slightly hesitant yet welcoming.

"Simon!" Marceline dashes over as she tackles the older man in a bear hug, Simon returning it in kind.

"How have you been? It's been a minute since we last talked face-to-face like this." Marceline asks as the two settle into their seats. Dirt Beer Guy quickly fills a glass of cranberry juice and slides it over into the vampire queen's waiting hand.

"I've been doing alright…How about you and Bonnibel? Things still going well between you two?" Simon quickly deflects, still somewhat nervous about talking about himself.

"Yeah, it's been going great. The tattoo bit didn't really stick, but afterward, we tripped over to the Slime Kingdom and had a crazy party with SP. Then we had something of an adventure after Lady Rainicorn took us to the Crystal Dimension when some bozo tried to take over the whole place. Apparently, he was a buddy of Lady's loser ex-boyfriend, but it was easy enough to kick his butt. But then Bonny had to deal with some Princess business, you know, boring stuff like that, so here we are." Marceline explained as she stuck her fangs into her drink, draining the red from the liquid. "But what about you, Simon? What have you been up to?"

The question was innocent enough, but hearing it still made him mentally recoil. The last thing Simon wanted to do was burden her with worries. His gaze drifted across the dimly lit tavern, landing on the old, worn-out jukebox in the corner, a silent witness to countless nights like these. Dirt Beer guy had read the room and made himself scarce to provide them the privacy needed. His thoughts were a tangled mess, each one a thread of his long, complicated history. He knew Marceline deserved to hear it all, but the fear of overwhelming her lingered in his heart. Still, after everything he experienced, he promised himself and Betty that he would treat his life with more worth. And the first step to that was allowing others to worry about him.

"She deserves to know, after everything we've been through," Simon thinks to himself, taking a deep breath as he begins.

"Well, where to start? Honestly, things weren't so good for me a while back. I was kind of going through a rough patch." Marceline's expression shifts, her eyebrows knitting together in concern, but he presses on.

"Truth is, Marcy, I've been feeling disconnected for a long time from all this." Simon gestures vaguely to everything around him. "After losing the crown, I struggled to accept my place here in Ooo. All the magic, all the futuristic stuff, all the madness, I just couldn't relate to it anymore once I was no longer the Ice King. I tried to get my mind off it and press through, and even Finn tried to help me out with it…"

Marceline suddenly scowls. "Yeah, Finn told me all about your little trip into the Forbidden Forest. I bopped him on the head when he told me about how you 'helped him' with fishing."

"Please, Marceline, don't be too hard on him." Simon assuaged her. "It may not have been the best way to go about it, but he really was only trying to help me. You know he's been struggling a lot himself after Jake's passing."

The duo shared a somber expression as they recognized this truth. Finn tried to put on a happy facade, going around Ooo on even more adventures than ever. Still, his friends secretly knew he was only trying to push down his real feelings and pain at the loss of his best friend and brother. They knew they would need to help Finn through that pain one day, but now was not the time. Simon took another deep breath as he started up again.

"And in a way, I understand what he's going through, even if it's somewhat different. After I lost Betty, I felt like I was adrift, without an anchor." His voice was a whisper, barely audible over the soft hum of the tavern's old air conditioner. "I was lost in my grief, and the world... it just kept moving forward without me. Which is when I tried to do something really, really dumb…"

With that, Simon told Marceline everything: the failed ritual, his journey with Fionna and Cake across the multiverse, his final reunion with GOLBetty, and the valuable lessons he had come to learn from all those experiences.

Marceline was speechless. Her bangs shielded her eyes as her face hung low over the bar, making it hard for Simon to tell what she was thinking.

"Well, it was all certainly a crazy experience, but I guess going through all of that was what I needed to get my head on straight." Simon gave a dry, humorless chuckle. "After all, if it weren't for that, I may not have even —" The rest of his sentence was cut short as Marceline threw herself onto him, wrapping him up tightly in her arms. He was caught off guard but quickly snapped back to reality as the vampire's soft weeping filled his ear.

"I'm sorry. I'm so, so sorry, Simon." she sobbed, her heart aching at the thought of everything her guardian endured while she was out partying it up. She clutched onto the man even tighter, as if she feared he would vanish the moment she loosened her grip. Simon could only respond by reaching around and rubbing her back.

"Oh, Marcy, you don't have anything to apologize for," he whispered in a soothing voice, the same voice he would use whenever she woke up from a bad nightmare when she was younger. "You have your own life to live now, with your girlfriend and your music. I didn't want to bog you down with an old man's problems."

"You're part of my life too, you butt!" Marceline snapped as she finally pulled away from Simon, anger filling her voice. She tried to glare at him, though the tears weakened it. "Heck, I probably wouldn't even have this life if it weren't for you. I would've died or ended up like that twisted version of me and calling that creep the Vampire King dad!"

Several pangs of silence followed her outburst, the two just exchanging glances - one tinged with remorse, the other with frustration. "Simon, you know you could have reached out to me anytime," Marceline said solemnly, finally settling down a little. He just shook his head at her.

"I'm sorry. I just didn't want to burden you with unnecessary worries." He murmured, his shoulders tensing slightly as he averted his eyes from her.

"You are not a burden. You're the closest thing to a real father I've ever had. You were there for me when I needed you most. Now it's my turn to help you. Let me be there for you." She said with complete seriousness, her voice tinged with a hint of pleading.

"You always told me that I saved you just as much as you saved me, but that's not even close to what you did for me, and you know it. You found a child alone in the ruins and cared for her as if she were your own. You protected me, provided for me, and even taught me how to read and write. Even when it was time for you to go, even when you could barely remember who I was or even who you were, you still did everything you could to make sure I would be alright by contacting my dad in the Nightosphere. All for me." Her voice broke slightly, revealing the vulnerability beneath her determined exterior.

Marceline began to tear up again, the pain and guilt washing over her as she began pleading again in full force. "Please let me help. Whatever weight you're carrying, I can handle it. I'm here for you, always. Please don't shut me out. I just got you back; I can't lose you again."

"Marcy," Simon finally replied, his voice filled with a paternal warmth as he embraced her. "I'm sorry, I didn't mean to. It's alright. Everything will be okay, I promise."

Marceline leaned her head into his shoulder. "I'm all grown up now, Simon. You don't have to hide your troubles from me."

"I know, I know you are. But I can't help wanting to protect you; in my eyes, you'll always be my little Marcy." He pushed her out to face him, bringing out a handkerchief to wipe up her tears, just as he always did when she got hurt or was feeling sad.

"But I really have been doing better," Simon reassured her. "I've been seeing Dr. Campbell for the last month since I returned. The therapy sessions have been helping me a lot."

Marceline sniffles but begins to perk up. "Well, I'm glad to hear that, at least. So what's next?"

"Well, for one thing, I'm definitely planning to move out of that museum apartment soon. Dr. Campbell and I both concluded that it was not doing good things for my self-esteem."

"Good," Marceline said firmly. "I was trying to be supportive about it before, but honestly, I always hated your job. It was demeaning."

Simon lets out a small chuckle, "Well, I guess now I can add 'Professional Exhibit' to my resume. Right between 'Ice Wizard' and 'Antiquated Academic.'"

Marceline lets out a small laugh. "You're silly, Simon." Simon joins in her laughter, marking the first real moment of lightness they've shared all night. It feels like a release, a breaking of tension that had been building since he first sat down.

Encouraged by this lighter mood, they delve into deep conversation. They talk about everything and nothing – old adventures, shared memories, and their hopes for the future. They discuss other serious topics, but there's an undercurrent of ease and warmth between them as the hours pass them by, leading straight into the morning.

As the first light of dawn sneaks in, Marceline looks around, surprised. "Wow, did we really talk all night?"

Simon nods, a gentle smile on his face. "Seems like it. I haven't done this in... well, forever."

There's a moment of comfortable silence as they both take in the breaking day. Marceline then turns to Simon, her expression soft but earnest. Standing up, they share a long, comforting hug.

"Thanks, Simon. For everything," Marceline says softly.

Simon pulls back, looking at her with fondness. "No, thank you, Marcy. For listening, for being here. That alone is more important than you might realize."

"Ready for a new day?" Marceline asked as she put on her large-brimmed hat and gloves. They stepped out into the fresh morning, the world around them waking up.

Simon looked up at the sky, his eyes reflecting the soft glow of the rising sun. "Yeah, I am. And I'm glad you're here to see it with me."