From the other Timeline [slowburn, Sebastian x gn reader]

The immortal butler

Tw gore

The morning came and Sebastian gave you spare clothes.
As you got ready to meet up with the queen's guard dog in the dining room, everything looked fancy just like you've seen in the anime, Sebastian was about to pull your chair but you stopped him "it's okay I can do it myself" you muttered quietly, it'll atleast save you a little from his wrath, though Sebastian was just more surprised. You sat down Infront of Ciel, he was inspecting you trying to find anything odd about you, the breakfast was already on the table, as Sebastian poured tea in your cup ciel began asking questions and while you tried your best to answer them while not revealing that you're from a different timeline/universe. All of a sudden your phone made a ding, and you remembered you brought it to the room, sweating you tried to brush it off but the widened eyes Sebastian and Ciel threw you you knew you couldn't just brush it off, Sebastian looked like he was about to kill you right then and there, you tried explaining yourself "what was that sound [last name]?." "What sound?" "Don't play dumb. What was that sound? What do you have in your pocket?" Sighing you knew you wouldn't get out of this so you took the phone out of your pocket and showed it to him, ciel looked at Sebastian and Sebastian took it first and inspected it "What..is this? I've never seen this thing here ever" once again he looked at you with a predatory look "It's a phone" "who do you take me for, a fool? You really think i believe you, a telephone is that" he said as he pointed at the Victorian wire telephone"not whatever this abomination is." He glared "okay uhh you see I'm not really from here, or rather I guess you could say future" you said disappointed that you couldn't keep that secret for more than 24 hours, but who were you to blame? This is Sebastian and Ciel were talking about, they'd find out one way or another eventually. The butler and the guard dog shared one more look as Sebastian told you to follow him, as he guided you down the hall to god knows where he suddenly stopped and in a blink of an eye and slit your throat, gasping as blood gushed out, you started violently coughing though with one final gasp it all stopped last thing you saw was Sebastians sadistic evil grin, you opened your eyes and this time you saw a wide eyed Sebastian, he looked like he's seen a ghost. Taking another huge gasp you coughed a few more times and you immediately touched your neck, it was no longer cut but the blood was still there, breathing heavily you try to process what happened, looking at Sebastian who was frozen in shock he quickly snapped out if it and tried stabbing you again, before he could you made a run for it, running as fast as you could, tho it was hopeless as he soon catched up to you, you gripped his wrist " FOR FUCKS SAKE STOP TRYING TO KILL ME, WHAT'D I EVEN DO?" you screeched, he didn't stop tho, not even paying mind that you cussed at him, he stabbed you repeatedly but you just didn't die, once he finally stopped looking at you not knowing what to do "If I liked you before I sure as hell despise you now" you murmured "either way DON'T STAB ME AGAIN DEAR GOD Can't you see I don't die?! And like I said I mean no harm" he glared down at you as he put his knife away "What are you? A grim reaper?"
"No but I wish I was so I could whip you from exsistence" you glared back as you replied, he grit his teeth, never knew you could make THE Sebastian lose his composure and actually show it, "So what now? You're gonna try stabbing me again or what" "No, as much as I desire to it won't matter, and letting you out is too dangerous as you will spill the secrets of the phantoms, I guess you'll have to stay here as one of Ciels servants" he said as he lead you back to the mansion, he explained everything to ciel "In that case [name] you will be my second butler" Ciel stated, Sebastian was flabbergasted "But master is that really nece-" "Yes it is now show them around the mansion and teach them the basics of being a butler"
Sebastian stayed silent for a few seconds "Yes, my lord" he said as he bowed down, then he got up and waited for you to go along.
who knew, a couple stabbing would get you to be the earl Phantomhives butler?

The end of chapter 2