So I read the episode in the wiki and found out this was actually focusing on another case, but I'm just gonna follow my old self, and stick with this one.
I realized I wasn't even following the original arc when I wrote this back in 2018, except the Book of Circus, Murder and Atlantic ones.

***

Looking at the probably expensive dress with many laces almost made you gag. What did you do to bring you up to this? Oh right, the offer. The party was tonight and you wish nothing but to stay back at the manor for this one. Not only that, there would be aristocrats and people... And the reason you were needed there. Trafficking. The thought of it sent a shiver down your spine.

You muttered a few words under your breath before you tied your hair, picking up the dress. As you were starting to undress, Sebastian suddenly opened the door to your room without any warning. You jumped at his sudden presence and shouted at him. "God! Don't you know how to bloody knock?!"

Sebastian merely chuckled, stepping into your room. "My apologies, I'm here to help you get prepared for the evening." He excused, walking over you. You peered up at him, eyes squinting at the question. "You what?"

Sebastian opened a drawer from your dresser, digging out a set of corset. Your brows narrowed as he walked to you. "Don't tell me!"

"Most women use this to fit in their dresses, kitten." He spoke easily. You huffed a breath and held your hand up at him. "Well, I am not most women, so you can cross that one out!" You crossed your arms, putting on a cocky smirk.

"Y/n, do you not know that this is basic?" Sebastian's voice lingered in demand, clearly tired of your bickering.

Of course, you knew how women dress properly. What you didn't know was how they do it. You just never dressed up in such a way or dress somebody else. Plus, it wasn't like you wanted to dress like that.

You let out a frustrating groan, taking the defeat. "Fine! Just do it." You shrugged, putting your hands on your sides. "You haven't even change into your chemise yet." He let out a tired sigh, picking up the white underdress. You grumbled, snatching it from his hands and walked in the bathroom to put it on.

When you got out, Sebastian was holding up the corset in his hand that caused you to let out a groan. "Do I have to?" You whined, slouching your shoulders. "Yes, be quiet, come here." He motioned you to him by with his head. In the end, you gave up and let him. 

Sebastian wrapped the cream-coloured border around your torsos he started to tie it. "H-hey! Slow down! That hurt-" You gasped a breath as he tightened the strings, pressing your abdomen. You held the footboard of your bed as another one on your stomach. "It's tight enough! Stop!" You reached your hand behind to try and slap his hand away.

He finally pulled it for the last time and tied it secured. You put a hand to your now tight abdomen, taking a few breaths. You glared at Sebastian as you tried to adjust with the strings. "Why do women even wear this?" You brushed your hand down your body.

((I don't know if maids back then also use a corset, but let's put that aside here))

Sebastian picked up your dress, showing it up. He smiled at you, signalling you to wear it. You rolled your eyes and let him put on the dress. You looked at your reflection in the mirror, straightening the silk fabric of your skirt. "I look stupid." You mumbled through your gritted teeth.

"You'll get used to it. Other than that, I think you look stunning, kitten." Sebastian cheered, walking by you, looking at you through the mirror. You felt yourself slightly blasting at the words for you had never heard anyone say it to you. "Sh-shut up! It's not like I like it or anything. Besides, I prefer trousers, still." You turned your head to him, hands clutching to your skirt. You see him cast a smile, another blush tinted your cheek as you realized how close you were.

You let out a breath and moved away from him. You were still not used to be in... What you called a relationship. "Oh, if I have to wear a bonnet, I swear to God—"

"You can put that aside." Sebastian denied your words. He then lent his hand to you, another one on his back as he bowed slightly. "Shall we?" You stared at his hand, face getting flustered than before. You couldn't believe how this man was able to make you feel like this and brought out a soft side of yours.

You pursed your lips, shyly taking his hand in yours. He chuckled at your flustered form. "You know it's funny to see you like this kitten. Usually, you are... " Sebastian paused as you both walked out to the foyer. He tried to find a word to describe you until you finished his words. "Loud?"

Sebastian stifled a small chuckle through his fingers, "I'd rather say rebellious." You pouted at him, looking away. "But surely you have a soft side somewhere." He continued, tapping your hand on his. "Yeah, keep dreaming." You scowled.

As both of you arrived at the foyer, Ciel was already in his suit, ready to run the mission. "Great, you're ready. Let's go."

  >  >>

"Aleister Chamber?"

"Ring any bell?" Ciel questioned as he explained the case further down. You shook your head slightly, denying the question. "Not that I know of." You shrugged, looking out the window of the carriage, leaning on the cold glass.

You watched the people outside as you realized how you were in a carriage, with one of the aristocrats. You remembered how you used to be them, the down class, living in the slums as they held up a fight against the arrogant nobles. Just to think about it brought a shiver to your skin. You shook your head, clearing your head and faced away, crossing your arms.

Sebastian noticed your mood change, his face mirrors his concern as you slouch your shoulders. The whole trip to the destination went out quick, the carriage finally stopped as you saw an elegant mansion out the window.

Sebastian was the first to step down, he offered a hand to you, which you took. Lifting your skirt a little, you took small steps down, as Sebastian then helped Ciel afterwards. Ciel made his way in the building as you held into Sebastian's arm. "Couldn't get yourself off of me, kitten?" He teased, sending you a smile.

You gave him a tired look, "Be quiet. I'm holding onto you because I can't walk in these!" You grumbled, showing up the heeled leather boot you wore. "Seriously how do they use this?!" You stomped your foot to the ground a couple of times, letting out a frustrated sigh. Sebastian chuckled softly, giving your hand a gentle squeeze as you entered the manor. "You'll get used to it."

You grimaced at his reply, "Easy for you to say." As you entered the ballroom, the scent of lavender hit your nose as you saw a bunch of nobles here and there, secluded in their own groups.

  >  >>

As Ciel and Sebastian discussed the case, you decided to sit back on this one. The nobles around you were already making you sick. That's when a certain face came by your side, tapping your shoulder. "My my, new faces I see?"

You nearly jumped when a voice sounded behind you. You peered over your shoulder, only to see a blonde man in a white suit. "Aleister Chamber, my lady." He said, taking your hand in his as he kissed your hand.

You grimaced silently, eyes landing at Sebastian and Ciel behind him. Ciel gave you a nod, telling you to follow the plan, in which you had no choice but to have to. You internally groaned and forced a smile.

"Please to meet you, I'm-" You suddenly stopped mid-sentence, remembering that Ciel hadn't assigned any name for you. "Umm... I'm Gabrielle..." You stammered, leaving an uneasy smile. "You're not from around here, are you not?"

You shook your head, "No... I—” You didn't even get to finish your sentence when he interrupted you with his self-boasting when another guest came by him. But that didn't distract him from focusing on you. " what brings you here?"

You dramatically put a hand to your chest, batting your eyelashes. "Oh, well, of course, I would never miss a party as grand as this." You faked a laugh, pretending to slap him with your hand. Aleister laughed along with you as he placed a hand behind your back that caused you to flinched at the sudden touch.

"Would you come with me for one moment? There s something is like to show you that I think you might like." He spoke up, ending his sentence with a wink. If it wasn't for the mission of would punch him right in the face right now. But you covered it up with a small smile. "Oh, please. I'm sure whatever it is you own I will like." You all nothing but accepted his offer, going this won't end the same as last time.