Soulmate Sebastian x reader

CH 37 Angels have soulmates too

In chapter 36~

"What are you going to do?" Ciel said as he grabbed the female's arms.

"Let go," Y/n glared at the boy who sightly shivered.

"Let him do his job," Ciel said.

"If it means letting your lover have sex with someone else then no," Y/n snarled. "And if he does then I will never forgive him,"

"If I said it was an order?" Ciel said sternly.

"Have you ever been cheated on?" Y/n asked as she looked at the floor her eyes clouded.

"N-,"

"Then you will never understand this feeling," Y/n scoffed.

"But what is it was an order? Sebastian needs to do his job," Ciel argued.

"Then I will never forgive both of you," Y/n hissed as she pulled her arm away. "Are you going to stop me?"

Ciel stayed silent before he shook his head. He then watched as the older woman walked towards Sebastian who was just about to close the door...

"Sebastian... stop!"

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Sebastian looked at his girlfriend before excusing himself and slightly coming out of the room. 

"What?" He asked. 

"What?" Y/n mocked. "Your gonna have sex with her and you say what?" 

"It's just meaningless sex," Sebastian tried to explain. 

"Meaningless sex?" Y/n repeated as her gaze sharpened. "Have you not have a clue what happened to me when I was dating Claude?" 

"...," Sebastian went silent after hearing her words... He remembered what she exactly said... and what he promised. 

Flashback~

"Sebastian...," Y/n called out as they were on a picnic date. (Special Chapter for 1K) 

"Yes?" Sebastian asked as he looked at her. 

"You...you won't cheat on me right?" Y/n asked, her fringe shadowing her eyes.

"...Where did that come from?" Sebastian asked confused as he held her chin up to see her eyes only to be quite startled at her teary eyes. 

"If...if you cheat on me I'll never forgive you!!" Y/n slightly shouted her shouts sounding more like sobs.

"Of course I won't cheat on you," Sebastian panicked as he hugged her, gently patting her hair so that she could calm down. "But why are you asking?" 

"...You know I've told you about Claude? H...He cheating on me... not... not just once but multiple times... even when we were dating... even when I trusted him and he promised not to cheat... he cheated on me...," Y/n said her voice wavering as her eyes became distant.

"I promise you," Sebastian said in a gentle tone as he genuinely smiled. "You can trust me... because I'm your soulmate," 

Flashback end~

"You promised me," Y/n said softly.

"But this is work," Sebastian stated. 

"So... you would do it... for information... even if it meant breaking up with me?" Y/n asked her tone desperately searching for some hesitation in his.