DISCLAIMER: I am not the owner of Adventure Time, I am not making any profit off of this either.

WARNING: There WILL be mature content, close, but not explicit. This will have lesbian affairs.

It was Bubblegum's birthday, and Marceline was so nervous. Instead of sleeping with Bubblegum with the medication she invented for her the night before, she stayed up, wrote music for a bit, then went to her house to grab the gift. When going back to the castle, she hid it in a drawer behind all of her beauty products, and under a cloth that Marcy has never seen Bubblegum use. While the princess was still sleeping, she practiced how to show it. She wanted it to be the last gift opened. She even put it in a box, wrapped up, then the ring box itself was inside. She had everything pictured in her head. When the princess opened the box, she would've gotten down on one knee while the ring box was being opened. Then, when she looked Marcy in the eyes, after opening the ring box and seeing the ring, she would've said, "I love you, Princess Bonnibel Bubblegum, and I want to spend forever together," putting her hand in hers, "will you marry me?" But, she was so afraid of her parents reactions. Marcy knew that Bubblegum wanted to be married, but she didn't quite know how her parents would feel. But, there wasn't much time to think and worry.

Morning came sooner than Marceline thought it would, and she layed next to the princess before she could awaken, to hug her, and kiss her good morning. Bonni rolled over, to face Marcy, and her eyes opened slowly.
"Mmm, good morning baby." Bonni says.
"Good morning birthday girl."
Bonni smiles, "thank-you babe."
"You're 19 now, boo. How's it feel?"
"No different then yesterday."
Marcy knew that would change once the present opening came.
Her parents were knocking outside the door, "good morning sweetheart. Can we come in?" Marceline and Bubblegum seperate, knowing they wouldn't like walking in on the two cuddling.
"Of course! Come in!" Once Bonni says that, the door opens, and the queen is carrying a breakfast table with eggs, bacon, pancakes, and orange juice, with two straws. Enough for both girls actually, which was a bit of a surprise. "Happy birthday!"
"Oh! Thank-you guys!" The table is placed over Bonni's lap, and the two begin to eat. Her parents ruffle up her hair, and tell her to eat, take a shower, get dressed and come downstairs to celebrate her birthday. Which Bonni nods her head, agreeing too.
"See you in a bit honey." Her mother says, both leaving the room. The two begin to munch down their food, and they hop in the shower together. Cleaning one another off, though, washing their own hair. They smile at each other, not wanting the shower to end, but they have to. It takes about 25 minutes to shower, and they get out. Drying off, and heading out to her room (which is connected to the bathroom) and Bubblegum begins to get changed.
"Babe, can I curl your hair?" Marcy asks.
"Sure. Do you know how?"
"Yeah. I'll go get the curling iron." She walks in the bathroom, getting the curler, and plugging it in, waiting for it to heat up. Marcy gets changed while it's heating up. Once finished dressing herself, the iron is heated. She pulls Bonni between her legs, having them face to face, so she can get the front of her face. Once finished curling her hair, Marcy goes in the bathroom, to staighten her own, and put on makeup, which Bonni does her makeup as well.

When they woke up, it was approximately 10 A.M. Once finishing getting ready, it's about 12:30 P.M. So, not too long, but long enough to get her parents anxious. They walk downstairs, hand in hand, and Marcy's gift to Bonni, in her free hand.
"HAPPY BIRTHDAY!" The group of people in the living room yell.
"Oh, thank-you so much everyone!" Bonni is holding her free hand over her heart, smiling, letting go of Marcy's hand to hug her parents, and say hi to everyone. Marcy walks over to the gift table, hiding it in the way back, so it's grabbed last. Once placing the gift in the appropriate place, she walks over to Bonni, grabbing her behind, and holding her around her waist. She was talking to Finn, LSP, Jake, Lady Rainicorn, and Flame Princess. Even though Bubblegum's parents didn't really like Flame Princess because they were afraid of how unstable she was, they knew that it would make Finn happy, and having Finn happy, made Bonni happy.
"Oh my glob, you two are soo cutee!" LSP says, making the two blush. Bonni turns her head, kissing Marcy.
"Aww, thank-you so much guys."
"Sooo when's cake?" Jake says, everyone around them laughing.
"Soon, don't worry."
"How soon, is soon?"
"Probably a couple minutes."
"Alright guys, time for cake!" The king shouts.
"Or a couple seconds." Everyone giggles, then sits at the large table, other than Bonni, standing beside her parents. They light the candles, and begin to sing, everyone joining in.
"Happy birthday to you, happy birthday to you, happy birthday, dear Bonnibel, happy birthday to you!" Everyone sings in unison. She blows out her candles, eyes closed, making a secret wish. Cutting it would be a pain, seeing as the cake was probably twice the size of a wedding cake. Well, it kind of needed to be. Enough for all of Bonni's friends, and all of candy kingdom. It was approximately 3 feet long, and a foot wide. Also, it was triple stacked, each cake getting smaller as stacked, but not lessening in width. It was made this way so the cake slices didn't have to be so wide, because just once sliver of cake would be equal to how a usual cake slice density would be.
It takes about a half an hour just to hand out the cake slices itself. It doesn't take long to eat though - maybe about 10 minutes per person. But, seeing as everyone got a piece at different times, it was about an hour afterwards until present opening came. The butlers, even though they are celebrating her birthday as well, clean up the tables, and go to the washroom to drop them off - to wash later.

Once everything is taken care of, and the table is clean, they announce that it's time for presents. Marceline sits next to Bubblegum, as her parents bring over one present at a time. There is about 400 people at her party, and her parents got her like 50 gifts, which is 450 (approximate) gifts to open. So, it took forever to get to Marcy's gift.

"Lastly is..." Bonni scrambles for a name on the gift, which isn't written.
"It's mine babe." Marceline says, getting out of her chair. Bonni smiles at her, opening the box, seeing another box inside. It was time. Bonni pulled out the box, and Marceline got down on one knee infront of her, as the box opens. Everyone around them place their hands over their hearts smiling, and her parents are wide-eyed. Bonni looks at the rings, and gasps, looking at Marcy with a few tears in her eyes, and biting her lip to keep quiet.
"Princess Bonnibel Bubblegum, I love you more than anything. You showed me what love was. You filled my heart with joy and hope for the future. You're all I want forever. I know it's only been a short period of time, and we have been talking about this for a short period of time, but, we can always take time to plan. And, well, why wait to declare eternity with one another when we know that's all we want? So, will you marry me?" Marcy says, grabbing her hand, nervous for the answer. Everyone else has tears in their eyes, and her parents are anxious for the answer. Not showing much emotion.
"Yes, of course! I love you too Marceline!" Bonni pulls her up, and hugs her tight, kissing her. Everyone aww-ing to what they just watched. Marceline grabs one ring, and slides it on Bonni's ring finger. Bonni grabs the other ring, and slides it on Marcy's ring finger. The two girls smile, and kiss once again, everyone aww-ing again.
"So, you're my fiance now?"
"Yes of course!" Bonni jumps in Marcy's arms.
"Alright, well, we're going to cut the party short, so if everyone could please exit, we'll see you all soon. Thank-you for coming." The king says, forcing people out. Everyone exits, and Bonni's parents sit in two chairs, infront of the girls. "Sit, you two." Marceline and Bonni look at each other, sitting down. "Now, we are glad you two are in love, but, don't you think we are pushing this?"
Bonni looks at Marceline, in a way that says 'I got this, okay?' "Mom, dad, I am happy with Marceline, and I'm 19. You two told me when I was 15, that if I didn't find love before age 21, I would have to get an arranged marriage. I found love, so, how am I pushing it?"
"You've only been together for, what, 10 months?"
"And? I would've had to marry someone who I just met if I waited until 21. So, I don't think we are. We can take the marriage planning slow, then have the wedding. It doesn't have to be all right away." After hearing this, the parents look at each other, and nod. Agreeing that Bonni was right, and that she deserved happiness.
"Alright. As long as you're happy." The king and queen walk off, looking back around, "by the way, Marceline, you'll have to take Bonni's name if you want to rule with her." Then walk off. Marcy was okay okay with this. She hated her last name anyway.
"I was so worried about this babe, but, you're parents didn't seem as mad as I thought they would be, and now I'm so happy."
"I was a bit worried about them too. I so wasn't expecting an engagement ring though! Oh my goodness baby!" She hugs Marcy once again, kissing each other.
"I love you too. Let's take you out to a movie and a nice dinner. Maybe we can go spend some of that money at the mall."
Bonni giggles, and nods. They hold hands, and walk out, Marcy picking her up bridal style. They fly to Marcy's to hop on her motorcycle, and head to the movies. Once arriving, they take off their helments, and get ready to head inside, until Bonni stops them.
"Marcy?"
"Yes baby?"
"Promise me something?"
"Yes?"
"Promise you'll love me forever?"
"I promise that I will love you more then anything or anyone. Forever, and always." They smile, kiss, and head inside to buy tickets for a movie.