I pondered on about this topic a lot and I ended up thinking of a second chapter for this. I felt like the ending was already fine as it was, happy and sweet but I needed something more. Not to mention the amount of times I reread the original because I ended up really digging the plot.

Think of this as a special, just extra bits I wanted to add but didn't think of at the time.

Sundown
A year had passed since their relationship had begun. They were currently in their final year of high school. Thanks to (Y/n) pulling some strings, Seolhyun was in his class again. Their relationship only deepened as time had passed by and the school knew them for their reputation. The strict and cold hearted but kind student president and his beautiful quiet vampire lover. He kept his word about making sure no one would bother her. However having this sort of reputation would attract attention, and it surely did as people tried to get their shot at Seolhyun. Whether it meant the good way or the bad way.

A few of them were dealt with by teachers, suspensions and even expelling some students due to their actions. It wasn't until Seolhyun revealed her monstrous amount of strength that made those minorities of the school leave them alone. She had done this by nearly killing a few students for attacking both her and (Y/n). He luckily got her under control before she almost fed on one of them. And this of course did earn him another bite on his arms, another to add to his previous one.

As strong and intimidating he wanted to be, he was embarrassed to say that Seolhyun was the scarier one of the two. Even if he was more controlling of the relationship, she was definitely more dominant. It wasn't until time passed with their relationship that she began to get more possessive of him. She had gotten more clingy and gave him less room to breathe. Her pouts and complaints of when girls looked at him were always hilarious to (Y/n). He still ended up apologizing every single time, and that came with a blood offer. She still couldn't get over his blood, and it became a main source of food for Seolhyun. Though she still had to limit how much she could really have, he was open to it.

(Y/n)'s POV
"Ow! Wait, let me—" (Y/n) began to say but her fangs wouldn't retract. Her mouth was already buried in his shoulder and was softly sucking on his blood.

They both had merely entered the band room where he was about to take a seat but she came up behind him and jumped onto his back, sinking her teeth into him. His body slowly softened and his tenseness dropped allowing her to calmly feed. Any struggling would only lead to her becoming more fierce and may actually cause her to kill him. He was still playing with fire by allowing her to feed off of him. He was able to breathe easy when she finally let go.

She came around in front of him before roughly kissing him, her eyes were still glowing red. He cringed a little at the taste of his own blood but tried to enjoy it otherwise. (Y/n) pulled away before things got too heated between them two. Her eyes finally turned back to normal as her soft presence finally came back to her as she climbed into his arms and apologizing for doing what she did.

"I saw you talking to that one girl... and I got mad seeing her smile at you." She told him as he laughed at her jealousy.

"She was asking for the notes from yesterday's lesson, nothing more. Besides, she ships us anyways." He told her as she fully straddled his lap.

"Still, I don't you talking to other girls. You're mine." She said that final part quite aggressively.

"And I will continue to prove to you as many times as it takes that I'm yours alone." (Y/n) told her as he gave her a peck on the forehead.

His sweet action was short lived as he began to feel her fangs against his neck again. (Y/n) quickly pulled her off before she could bite him.

"Seolhyun stop, you just had some. If you take anymore I'll lose focus during class. Don't you remember last time? We got in trouble because you took too much." He told her as she tried to restrain herself.

"You better not—" She began saying but he continued on.

"And then there was also the time when we got in trouble because you bit me during class. I had to carry you away so people wouldn't have to see you sucking my blood." Her face turned into a frown and her lips turned into a pout.

He held her face softly as her embarrassment grew at the memory of her actions. (Y/n) poked at her cheeks and teased her more.

"You're older than me, stop acting like a kid. Should I start calling you noona?" He continues with his teasing before she threatened him with a bite, making him stop.

"I can only give you so much okay? I don't want to die and leave you alone." He told her.

"You can have a little bit more when we get home. A little extra because I love you." She smiled again the sound of his promise.

They met with another kiss once again but it was short lived as the door opened and a few people witnessed the scene in front of them. Seolhyun jumped off of his lap before standing up straight. Speaking of that girl from earlier, there she stood among the few others that had seen them. His fresh bite was still uncleaned with dried blood. Whispers were passed among them as they proved the stories true about their relationship. She really was a vampire and he was her human lover, who occasionally fed her his blood.

(Y/n) stood up and walked over to the small crowd while Seolhyun waited behind. He took a second to note who they were, before realizing they were all mostly first years. They must've heard the stories that were passed around. There was no way the two could live in peace after that huge reveal from last year. People will talk about anything and they never let it go after a year.

"Is there something wrong? Got a problem?" He asked, they all rapidly shook their heads. That was enough for him to shut the door in front of their faces and locking it.

(Y/n) walked back over to her before continuing where they had left off. It lasted a while before they had to leave to return to class.

Later
The day ended as they both began their walk home. They eventually walked past Seolhyun's house along the way to his. They had already gotten used to somewhat living together a while ago. She would even spend nights with him at times. With a year into their relationship now, they'd done pretty much almost everything together. Their last barrier was the final deal and (Y/n) refused to break it until they got married. It didn't matter if they used any form of protection, he wouldn't risk a percent that he'd get Seolhyun pregnant before they graduated. It was quite hard at times when she was so convincing and demanding about her needs. The most they've done is pleasing the other person, but (Y/n) would always stop them from going to far. Most of the time it was just him doing all the work, and stratifying her needs. It was almost like another substitute for his blood, not exactly the same but enough to distract her so that she wouldn't need to feed from him.

Seolhyun tossed her bag onto the ground before crashing into his bed. (Y/n) picked up her things before neatly placing them against his chair. He also laid down next to her before she cuddled up next to him. It didn't even take a second before he felt her fangs running against his neck.

"At least let me sit up, I don't want blood to spill on my bed." He said before pulling her up.

(Y/n) moved towards the edge and peeled off his shirt a little to avoid any more stains. He luckily stopped her just as she was about to bite him, pointing to his lips. She made her payment with a kiss before gaining access to his blood. She knelt down behind him before slightly tilting his head away and making the bite. He had to let her live it short as he quickly tapped her hands to let her know to stop. Her fangs quickly retracted after before cleaning off any excess blood. (Y/n) began to fix his shirt while she shifted behind him.

"(Y/n)... are you sure we can't—" She began saying as he turned around. (Y/n)'s jaw dropped at the sight in front of him, his girlfriend sat there shirtless.

"Do we really have to wait? I'm sick of not being able to do something more." She told him.

"Yes, we do need to wait. I'm not risking it, if you end up pregnant now, it'll be bad for the both of us. There's still so much we have to do." He told her, grabbing her shirt and covering her chest.

"Can't we just try...? I've been thinking about it and I can't get over it. I just really wanted to claim you." She said leaning her head into his chest.

"I'm sorry Seolhyun, but I can't." He answered, making her more upset.

"On our graduation day, we can do it then. I'll promise you that, if you want to claim me then do it the day we graduate." He told her, cheering her up a little as she thanked him. She stood up and was about to walk away but he grabbed her hand and pulled her back.

"Take your pants off, I"ll help you calm down." He told her, as she rapidly began to do as he asked.

Timeskip
This night couldn't have gone any better. The moment they would finally walk across that stage, it felt like they had only met yesterday. Yet, here they are linked together and graduating from high school. Both their their families had shown up to celebrate with them. And that was where he pulled off his move, while she was being cheered on by her family, (Y/n) took the chance to get behind her. Their families and even classmates cheered louder at the sight of him kneeling down while Seolhyun had no idea what was happening. It wasn't until she heard his voice that made her turn around.

"Seolhyun." She turned towards the sound of her name being called.

There he knelt with a boxed ring in his hand. Her hands immediately shot up to cover her mouth as a rush of emotions erupted within her.

"A promise is a promise. I said I was yours forever, so will you marry me Seolhyun?" She answered him by grabbing his face and giving him a kiss. The crowds cheered at the sight as (Y/n) slipped the ring onto her finger.

They spent that night alone at his house. One final step awaited them, and (Y/n) was ready now, more than he ever would be. It didn't mean he wasn't afraid though, these were his final moments as a human. He waited within his room, while Seolhyun prepped her own blood for him. Eventually she knocked on the door, coming in with a small bowl of red liquid. She sat beside (Y/n) and comforted him with a small kiss.

"Are you really sure about this...? I can wait, you don't have to rush (Y/n)." She told him.

"I already promised you this as well. I'll spend the rest of my life with you, I'm all yours for all eternity." (Y/n) answered in return causing her to feel nothing but joy.

Seolhyun handed him the bowl, but he quickly set it aside immediately. (Y/n) turned back to her and tilted his neck a little.

"One last time right? We don't know if my blood will taste the same for you, so here." She smiled at him before crawling into his lap. After paying her kiss, she tasted him once again. The sweetness of his blood was just as amazing as it was the first time she bit him. It was sad to be giving it up, but he was sacrificing much more in return.

She pulled away soon after, giving him some space. (Y/n) held the bowl in his hands watching the blood swirl a little. Seolhyun could see the emotions on his face, making her feel guilty. He was scared, why wouldn't he be? He was about to throw away his humanity all for her. His love prevailed this much for her, so much he would give up his life to be with her.

"(Y/n)—" She was about say more but he cut her off by lifting the bowl up. A few gulps were heard before he suddenly dropped the empty bowl onto the ground.

His body began to shake violently as Seolhyun tried to hold him down. Using her strength she was able to fully restrain him and soon enough he stopped. His eyes had shut completely and his body had gone limp. She didn't want to worry, she knew they did everything correctly according to her parents. But seeing his lifeless body scared her beyond anything else. Seolhyun was finally relieved of her stress when his eyes opened and stared up into hers. She leaned down and kissed him whispering words of love to him.

"Your smell is so sweet... is this what you always meant about me?" He asked making her smile brighter. She turned her neck for him, offering him a taste. But he refused, instead taking her hand and softly biting into her. His eyes widened at the taste of her sweetness, before stopping himself. He traded with her, by offering his own blood after. Still just as sweet as it was moments ago.

From strangers to boyfriend and girlfriend, and recently engaged, they really were soulmates. They were sealed together for life, in this life and for many more together. He'd find her again and again, it didn't matter what would come between them.

"You have one more promise to make up." She told him.

"You really can't wait can you? Go ahead then, mark me, I'm all yours." He told her as she began to peel off her clothes.

(Y/n) followed after and began to strip his own clothing off. Their first time together was a bliss, as they both fully explored their partner's body. She made her claim with a final bite, leaving a sealed mark on his neck. He did the same, gentler on hers as well. This marked them for life and it was their first night of their new life together.

Okay, I'll just end it here. I'm not much for an actual happily ever after so this is my form of sweet endings. I was planning a smut but I cancelled it due to another idea I came up with. I was too excited for it, I could barely finish this chapter. This isn't really a complete chapter, and also a very short one. I'll see if I want to do another extra for Seolhyun or not.

Next: Irene&Wendy
(I'm honestly really excited for this one. I ended up writing for this new chapter more than this one. It'll probably take me longer since my finals are coming up soon. I'll see how this turns out.)