If you want to fully enjoy the story and feel it's emotions then I will recommend you to go to YouTube and download some "dark piano" music. It will take your five minutes. Always listen to them while reading the story.
Highly recommended :
Melancholia Music Box

월광

There they both entered the restaurant, she wore a red full length dress for the beautiful eve with her fiance. Reaching their table he pulled back the chair for her and she took a seat smiling. The waiter pulled back his chair and he took a seat too.

It's not like he don't want to marry YN or he is not interested in her. He himself proposed her and he surely still want to marry her. It's just showing any love or affection was not his thing. He had his own standards of life.

According to him acting all lovey dovey is so cringy and out of his standards. He might marry YN, protect her, take her responsibility and would like to make kids too but he was nowhere planning to be the loving type of person. He was not like this nor he was going to change for anyone.

The waiter came to fill up their glasses with wine but he refrained and sent him away. Grabbing the bottle he filled their glasses himself. It must be annoying to repeat it but yes that included in his standards. Don't misunderstand it with a gentle gesture just like YN was doing at the moment. He was a businessman. Attending meetings and formal dinners it had became more like a habit to him.

Both of them clicked glasses and she had a smile on her face. She was actually treasuring the affection but it was a bit too quiet for a date. "How's work going?"

Jay : " Mmm it's going great."
Ordering the food, the dinner went a bit boring with both of them talking about random affairs.

YN:" Granny want us to get married already."

Jay: "Yeah, She asked me about it too.By the way YN I was thinking It's been almost two years since we are in a relationship but never got intimidate towards each other."

YN : " You want to?"

Jay : "we are going to marry. That won't be wrong though."
He said calmly taking a bite of his food. She felt a strange kind of shiver run down her spine. A part of her didn't want to accept and a part of her didn't want to reject it either. She wasn't ready for it but nothing was wrong in it. They were going to marry and at this point she couldn't step back.

YN : " I have no problem with that"
He nodded and the rest of the dinner went all quiet. He didn't say anything else and she had no idea how she was supposed to react. She was feeling nothing. No nervousness, no excitement. She was supposed to act hyped up or completely want to run away but it's just...... Nothing

Slowly she was losing all her feelings and at this point the only thing that scared her was her own self.

They both reached home and Jay took her to his room to spend the night with him. Entering in room he removed his coat turning to her. Loosening first two buttons of his shirt he walked to her trapping her in between his arms and the wall. "I waited for this moment a lot."

YN : " You could have say it before."

Jay :"I thought you might not be ready for it."
Putting his both hands on the wall at each side of her and moved forward sniffling her neck. She closed her eyes. She wanted to enjoy this moment. She wanted to feel it. It was her first time but surprisingly her heart was not responding to anything and the thing that was more surprising was it didn't scare her at all.

Jay :" I always loved white on you because you look like an Angel..... My Angel, in it but today watching you wear red for our date." his nose nuzzled against her neck making him impatient to have all of what belongs to him.

"made you look like a goddess...... My beautiful Goddess" Her movements came to stop in a jolt. She felt like her heart stopped beating hearing that. The voice...... That voice didn't belong to Jay. She have heard it before. This voice is her worst nightmare.

She opened her eyes that immediately widened at the figure standing so close to her. Her surroundings changed completely. It was giving her the kind of aura that will not only give you goosebumps but leave cracks on your bones.

His head tilted a bit to a side just like before. The cracks on his skin and the devilish tattoos on his neck made him look so beautifully sinful. It has happened before and this time at least she was in that much senses to realize what was happening before. He was not anywhere like the Jungkook she know. She wanted to run away. Why was this happening again. She was with Jay.

Jungkook: " I have been waiting for you and you decided to give yourself to someone else."

YN : " W-who are you!?l-l-let me go."
It took her everything thing to let out those words from her mouth. She felt so empty, like they were standing in a Void. It felt like there was no presence of air around. She couldn't feel her heartbeat, no flow of blood through out her body. For a moment she thought she was dead.

Jungkook : "I didn't came after you to let you go."
His eyes started turning red again. That's where she felt like she was getting hypnotized again. A rush of chills went down her spine and wind of horror that blew past her making her dizzy.

It was making her wanting to do things.... A lot of bad things. Just like a devil who pulls the strings and make us dance in the sinful music. Make us find delight in the most loathsome things. Just like it's his devilish art of the play area he built for us and the most frightening thing is we don't feel horror in stepping towards hell ourselves.

YN : " what do you want?"

Jungkook : " You."
He smirked deviously and the next moment she found herself being thrown at the majestic red colored bed covered with white silk sheets. Trust him, she was looking so tempting wearing red, being displayed over white silk sheets and he was going to have all of his beautiful doll.

Her hands suddenly cuffed to the headboard of bed with invisible strings and the next moment she found him above her so close to her that if they move, their lips might touch. She wanted them to, it was not in her hands to control herself anymore.

A shaky breathe escaped her lips when he attacked her neck. Sucking each and every part of her and most surprisingly she was enjoying it. She enjoyed it to its extreme and with each second passing by she wanted more and more.

A sinful whimper escaped her lips when he bit over the same part from where he sucked out her blood."You know why I want you?" he said receiving a moan in response from the beautiful girl who was almost as tempted as him, right under him.

Jungkook : "You wear Moonlight like a lingerie" Within a blink of eye he tore her clothes off of her body. He licked her so she's his and that's where a wave of cold sensation passed through his body. He was going to have all of her so no one will have what is his.

The girl moaned under him like he took her to hell but the most pleasured one. Their lips mold against each other like they belonged to each other. Passionate yet rough. He didn't even have to remove his clothes. Within a blink they were off of his body. Each and every moment that passed by felt like a magic. Just like she was in a magicland. Twirl your stick and boom.

He calls her a goddess..... A goddess of the moon because she always shined the brightest under the moonlight of his world. Just like she was doing right now right under him. Earning the most delightful screams from her like they were your seductive lullabies in your lonely nights.

He was much more rougher and much more harder than any monstrous human could ever be. Because he was much more than any human could ever be.

There goes a rule, that he learnt and he did.

'Seduce and Destroy.'